Skip to main content

Exelixis Inc (NQ: EXEL )

33.20 +0.76 (+2.34%)
Streaming Delayed Price Updated: 4:00 PM EDT, Oct 31, 2024 Add to My Watchlist

Historical Prices

Date Open High Low Close Volume Change (%)
May 30, 2003 8.100 8.170 7.580 8.070 830,400 -0.02(-0.25%)
May 29, 2003 8.050 8.170 8.000 8.090 347,600 +0.06(+0.75%)
May 28, 2003 8.130 8.150 7.950 8.030 385,300 +0.00(+0.00%)
May 27, 2003 8.180 8.300 7.950 8.030 518,900 -0.04(-0.50%)
May 23, 2003 7.920 8.140 7.870 8.070 505,400 +0.17(+2.15%)
May 22, 2003 7.570 7.910 7.480 7.900 364,800 +0.26(+3.40%)
May 21, 2003 7.540 7.680 7.350 7.640 276,400 +0.08(+1.06%)
May 20, 2003 7.240 7.570 7.240 7.560 181,200 +0.29(+3.99%)
May 19, 2003 7.710 8.000 7.200 7.270 327,700 -0.41(-5.34%)
May 16, 2003 7.720 8.000 7.620 7.680 319,100 -0.32(-4.00%)
May 15, 2003 7.940 8.100 7.870 8.000 236,100 +0.02(+0.25%)
May 14, 2003 7.740 8.090 7.740 7.980 330,100 +0.11(+1.40%)
May 13, 2003 7.820 7.900 7.690 7.870 286,800 -0.03(-0.38%)
May 12, 2003 7.630 8.000 7.630 7.900 193,800 +0.26(+3.40%)
May 09, 2003 7.710 7.850 7.590 7.640 201,110 -0.11(-1.42%)
May 08, 2003 8.330 8.390 7.750 7.750 252,200 -0.58(-6.96%)
May 07, 2003 8.370 8.690 8.230 8.330 108,600 -0.15(-1.77%)
May 06, 2003 9.370 9.410 8.390 8.480 910,700 -0.74(-8.03%)
May 05, 2003 8.430 9.370 8.390 9.220 524,600 +0.60(+6.96%)
May 02, 2003 8.520 8.750 8.460 8.620 287,300 +0.01(+0.12%)
May 01, 2003 8.490 8.650 8.390 8.610 295,200 +0.09(+1.07%)
Apr 30, 2003 8.250 8.520 8.120 8.519 304,200 +0.27(+3.26%)
Apr 29, 2003 8.100 8.600 8.000 8.250 565,700 +0.16(+1.98%)
Apr 28, 2003 7.700 8.100 7.670 8.090 141,500 +0.41(+5.34%)
Apr 25, 2003 7.720 7.900 7.650 7.680 87,100 -0.03(-0.39%)
Apr 24, 2003 7.960 8.000 7.560 7.710 213,800 -0.26(-3.26%)
Apr 23, 2003 7.480 8.000 7.460 7.970 301,700 +0.47(+6.27%)
Apr 22, 2003 7.370 7.510 7.250 7.500 246,600 +0.10(+1.35%)
Apr 21, 2003 7.290 7.420 7.290 7.400 104,100 +0.10(+1.37%)
Apr 17, 2003 7.240 7.370 6.960 7.300 90,800 +0.14(+1.96%)
Apr 16, 2003 7.460 7.470 6.850 7.160 132,600 -0.26(-3.50%)
Apr 15, 2003 7.400 7.450 7.100 7.420 180,600 -0.05(-0.67%)
Apr 14, 2003 7.470 7.500 7.260 7.470 113,800 -0.13(-1.71%)
Apr 11, 2003 7.120 7.600 7.010 7.600 388,000 +0.06(+0.80%)
Apr 10, 2003 7.120 7.540 7.010 7.540 101,500 +0.42(+5.90%)
Apr 09, 2003 7.540 7.560 7.000 7.120 317,600 -0.42(-5.57%)
Apr 08, 2003 7.060 7.540 6.960 7.540 91,100 +0.41(+5.75%)
Apr 07, 2003 7.160 7.550 7.030 7.130 161,200 +0.06(+0.85%)
Apr 04, 2003 7.140 7.350 7.070 7.070 112,300 -0.17(-2.35%)
Apr 03, 2003 7.350 7.350 6.900 7.240 183,500 +0.16(+2.26%)
Apr 02, 2003 6.860 7.150 6.700 7.080 152,500 +0.36(+5.34%)
Apr 01, 2003 6.560 6.880 6.520 6.721 134,400 +0.07(+1.07%)
Mar 31, 2003 6.500 7.290 6.350 6.650 360,621 +0.20(+3.10%)
Mar 28, 2003 6.689 7.020 6.450 6.450 229,211 -0.20(-3.01%)
Mar 27, 2003 6.290 6.690 6.000 6.650 179,150 +0.38(+6.06%)
Mar 26, 2003 6.100 6.320 6.100 6.270 117,378 +0.16(+2.60%)
Mar 25, 2003 6.250 6.290 5.750 6.111 35,580,000 -0.14(-2.22%)
Mar 24, 2003 6.490 6.500 6.150 6.250 207,133 -0.30(-4.58%)
Mar 21, 2003 6.670 6.840 6.550 6.550 591,612 -0.07(-1.06%)
Mar 20, 2003 6.370 6.670 6.020 6.620 155,535 +0.18(+2.80%)
Mar 19, 2003 6.820 6.850 6.000 6.440 252,328 -0.36(-5.29%)
Mar 18, 2003 5.950 6.800 5.930 6.800 835,419 +0.56(+8.97%)
Mar 17, 2003 5.710 6.790 5.700 6.240 245,899 +0.60(+10.64%)
Mar 14, 2003 5.750 5.970 5.520 5.640 121,533 -0.15(-2.59%)
Mar 13, 2003 5.220 5.830 5.180 5.790 94,600 +0.62(+11.99%)
Mar 12, 2003 5.150 5.230 5.010 5.170 104,300 -0.04(-0.77%)
Mar 11, 2003 5.310 5.430 5.100 5.210 60,800 -0.06(-1.14%)
Mar 10, 2003 5.430 5.540 5.250 5.270 69,900 -0.16(-2.95%)
Mar 07, 2003 5.480 5.620 5.410 5.430 38,700 -0.18(-3.21%)
Mar 06, 2003 5.940 5.940 5.500 5.610 77,800 -0.23(-3.94%)
Mar 05, 2003 5.730 5.920 5.720 5.840 51,000 +0.12(+2.10%)
Mar 04, 2003 6.000 6.030 5.720 5.720 57,900 -0.27(-4.51%)
Mar 03, 2003 5.760 6.000 5.690 5.990 151,000 +0.22(+3.81%)
Feb 28, 2003 5.720 6.170 5.720 5.770 368,400 +0.03(+0.52%)
Feb 27, 2003 5.550 5.750 5.410 5.740 84,100 +0.28(+5.13%)
Feb 26, 2003 5.600 5.660 5.450 5.460 57,100 -0.15(-2.67%)
Feb 25, 2003 5.420 5.700 5.050 5.610 95,000 +0.23(+4.28%)
Feb 24, 2003 5.450 5.800 5.260 5.380 190,800 -0.05(-0.92%)
Feb 21, 2003 5.460 5.500 5.250 5.430 69,700 +0.05(+0.93%)
Feb 20, 2003 5.590 5.660 5.260 5.380 88,300 -0.10(-1.82%)
Feb 19, 2003 5.760 5.800 5.350 5.480 90,600 -0.13(-2.32%)
Feb 18, 2003 5.720 5.780 5.450 5.610 163,900 -0.01(-0.18%)
Feb 14, 2003 5.460 5.740 5.400 5.620 50,300 +0.19(+3.50%)
Feb 13, 2003 5.300 5.460 5.250 5.430 88,000 +0.13(+2.45%)
Feb 12, 2003 5.350 5.460 5.210 5.300 87,200 -0.05(-0.93%)
Feb 11, 2003 5.350 5.350 5.040 5.350 130,000 +0.00(+0.00%)
Feb 10, 2003 5.830 5.830 5.060 5.350 96,100 -0.26(-4.63%)
Feb 07, 2003 5.650 5.880 5.500 5.610 184,500 -0.16(-2.77%)
Feb 06, 2003 5.640 6.000 5.520 5.770 96,100 +0.02(+0.35%)
Feb 05, 2003 6.020 6.060 5.740 5.750 172,100 -0.22(-3.69%)
Feb 04, 2003 6.080 6.080 5.630 5.970 167,700 -0.16(-2.61%)
Feb 03, 2003 6.450 6.450 6.080 6.130 82,800 -0.33(-5.11%)
Jan 31, 2003 6.760 6.820 6.450 6.460 172,100 -0.37(-5.42%)
Jan 30, 2003 6.540 6.970 6.320 6.830 235,444 +0.31(+4.75%)
Jan 29, 2003 6.450 6.750 6.400 6.520 365,100 +0.06(+0.93%)
Jan 28, 2003 6.790 6.830 6.400 6.460 310,600 -0.29(-4.23%)
Jan 27, 2003 7.110 7.220 6.700 6.745 269,100 -0.38(-5.40%)
Jan 24, 2003 7.511 7.560 6.980 7.130 276,100 -0.40(-5.31%)
Jan 23, 2003 7.490 7.770 7.000 7.530 425,300 +0.03(+0.40%)
Jan 22, 2003 7.680 7.830 7.470 7.500 273,900 -0.28(-3.60%)
Jan 21, 2003 7.600 7.800 7.480 7.780 140,200 +0.10(+1.30%)
Jan 17, 2003 7.730 7.770 7.470 7.680 144,400 -0.08(-1.03%)
Jan 16, 2003 7.850 7.890 7.650 7.760 216,400 -0.14(-1.77%)
Jan 15, 2003 7.940 7.950 7.800 7.900 236,800 +0.01(+0.13%)
Jan 14, 2003 7.600 7.940 7.540 7.890 360,500 +0.24(+3.14%)
Jan 13, 2003 7.700 7.780 7.400 7.650 445,900 -0.02(-0.26%)
Jan 10, 2003 7.330 8.000 7.260 7.670 227,800 +0.36(+4.92%)
Jan 09, 2003 7.160 7.530 7.160 7.310 260,200 +0.11(+1.53%)
Jan 08, 2003 7.260 7.300 7.150 7.200 83,000 -0.06(-0.83%)
Jan 07, 2003 7.550 7.550 7.150 7.260 145,600 -0.20(-2.68%)
Jan 06, 2003 8.000 8.010 7.360 7.460 234,600 +0.06(+0.81%)
Jan 03, 2003 7.500 7.600 7.260 7.400 139,300 -0.21(-2.76%)
Jan 02, 2003 8.030 8.030 7.360 7.610 277,900 -0.39(-4.87%)
Dec 31, 2002 6.980 8.110 6.900 8.000 643,300 +0.92(+12.99%)
Dec 30, 2002 6.990 7.110 6.830 7.080 177,600 -0.02(-0.28%)
Dec 27, 2002 7.210 7.280 6.850 7.100 143,400 -0.21(-2.87%)
Dec 26, 2002 7.510 7.740 7.070 7.310 176,900 -0.25(-3.33%)
Dec 24, 2002 7.750 7.850 7.350 7.562 89,800 -0.19(-2.43%)
Dec 23, 2002 7.890 8.310 7.600 7.750 179,000 +0.00(+0.00%)
Dec 20, 2002 7.890 8.310 7.720 7.750 306,100 -0.10(-1.27%)
Dec 19, 2002 8.000 8.230 7.620 7.850 251,600 +0.02(+0.26%)
Dec 18, 2002 7.850 8.100 7.770 7.830 104,800 -0.12(-1.51%)
Dec 17, 2002 7.990 8.250 7.850 7.950 76,200 -0.05(-0.62%)
Dec 16, 2002 7.900 8.030 7.730 8.000 157,200 +0.16(+2.04%)
Dec 13, 2002 8.160 8.300 7.830 7.840 141,900 -0.38(-4.62%)
Dec 12, 2002 7.920 8.270 7.850 8.220 144,800 +0.30(+3.79%)
Dec 11, 2002 7.850 8.100 7.450 7.920 218,300 +0.07(+0.89%)
Dec 10, 2002 7.740 8.150 7.740 7.850 289,400 -0.08(-1.01%)
Dec 09, 2002 8.050 8.160 7.800 7.930 334,800 -0.07(-0.89%)
Dec 06, 2002 7.749 8.200 7.450 8.001 421,400 +0.31(+4.04%)
Dec 05, 2002 7.790 8.000 7.580 7.690 215,700 -0.09(-1.16%)
Dec 04, 2002 8.240 8.350 7.490 7.780 382,900 -0.55(-6.60%)
Dec 03, 2002 8.550 8.580 8.050 8.330 224,700 -0.17(-2.00%)
Dec 02, 2002 9.000 9.000 8.310 8.500 474,600 -0.56(-6.18%)
Nov 29, 2002 8.130 9.410 8.080 9.060 909,500 +0.96(+11.85%)
Nov 27, 2002 7.249 8.210 7.210 8.100 692,400 +0.84(+11.57%)
Nov 26, 2002 7.500 7.520 7.000 7.260 301,900 -0.24(-3.20%)
Nov 25, 2002 7.490 7.630 7.260 7.500 292,600 +0.00(+0.00%)
Nov 22, 2002 7.500 7.700 7.400 7.500 173,200 +0.01(+0.13%)
Nov 21, 2002 7.850 7.900 7.450 7.490 353,000 -0.32(-4.10%)
Nov 20, 2002 7.500 7.850 7.220 7.810 282,300 +0.31(+4.13%)
Nov 19, 2002 7.300 7.730 7.300 7.500 175,300 +0.05(+0.67%)
Nov 18, 2002 7.500 7.970 7.300 7.450 190,700 +0.01(+0.13%)
Nov 15, 2002 7.350 7.590 7.000 7.440 466,900 -0.09(-1.20%)
Nov 14, 2002 6.810 7.540 6.750 7.530 458,400 +0.83(+12.40%)
Nov 13, 2002 6.430 6.920 5.780 6.699 494,900 +0.37(+5.83%)
Nov 12, 2002 6.110 6.460 6.050 6.330 319,400 +0.33(+5.50%)
Nov 11, 2002 5.870 6.090 5.810 6.000 214,900 +0.10(+1.68%)
Nov 08, 2002 5.850 6.090 5.700 5.901 467,300 +0.11(+1.92%)
Nov 07, 2002 5.720 5.940 5.550 5.790 309,300 -0.08(-1.36%)
Nov 06, 2002 5.450 5.950 5.380 5.870 704,800 +0.46(+8.50%)
Nov 05, 2002 5.210 5.450 5.050 5.410 242,700 +0.14(+2.66%)
Nov 04, 2002 5.000 5.340 4.750 5.270 461,600 +0.32(+6.46%)
Nov 01, 2002 5.000 5.050 4.560 4.950 400,000 +0.01(+0.20%)
Oct 31, 2002 5.040 5.140 4.900 4.940 405,200 -0.10(-1.98%)
Oct 30, 2002 5.190 5.240 4.800 5.040 793,200 -0.02(-0.40%)
Oct 29, 2002 5.900 5.900 4.850 5.060 3,925,400 +1.48(+41.34%)
Oct 28, 2002 3.480 3.660 3.460 3.580 226,100 +0.18(+5.29%)
Oct 25, 2002 3.510 3.600 3.350 3.400 263,015 -0.15(-4.23%)
Oct 24, 2002 3.840 3.840 3.480 3.550 300,492 -0.35(-8.95%)
Oct 23, 2002 3.950 4.060 3.600 3.899 140,600 -0.10(-2.52%)
Oct 22, 2002 4.250 4.250 3.987 4.000 64,200 -0.25(-5.88%)
Oct 21, 2002 3.850 4.260 3.790 4.250 111,100 +0.51(+13.64%)
Oct 18, 2002 4.120 4.450 3.480 3.740 180,900 -0.24(-6.03%)
Oct 17, 2002 3.700 4.140 3.700 3.980 181,800 +0.32(+8.74%)
Oct 16, 2002 3.600 3.790 3.410 3.660 209,120 +0.07(+1.95%)
Oct 15, 2002 3.439 3.880 3.350 3.590 379,900 +0.23(+7.00%)
Oct 14, 2002 3.300 3.650 3.250 3.355 373,296 +0.15(+4.84%)
Oct 11, 2002 3.100 3.590 3.100 3.200 400,810 +0.05(+1.59%)
Oct 10, 2002 3.090 3.230 3.000 3.150 465,950 +0.13(+4.30%)
Oct 09, 2002 3.000 3.200 2.950 3.020 455,600 -0.03(-0.98%)
Oct 08, 2002 3.100 3.350 2.950 3.050 536,700 -0.03(-0.94%)
Oct 07, 2002 3.100 3.450 3.000 3.079 350,200 +0.03(+0.95%)
Oct 04, 2002 3.700 3.800 2.960 3.050 537,329 -0.66(-17.79%)
Oct 03, 2002 4.000 4.050 3.700 3.710 192,600 -0.25(-6.31%)
Oct 02, 2002 4.250 4.260 3.950 3.960 335,720 -0.29(-6.82%)
Oct 01, 2002 4.490 4.500 4.050 4.250 258,263 -0.70(-14.14%)
Sep 30, 2002 3.950 4.950 3.800 4.950 570,100 +0.97(+24.37%)
Sep 27, 2002 3.970 4.100 3.880 3.980 122,200 +0.01(+0.25%)
Sep 26, 2002 4.230 4.230 3.700 3.970 195,300 -0.04(-1.02%)
Sep 25, 2002 4.000 4.200 3.941 4.011 130,800 +0.06(+1.54%)
Sep 24, 2002 3.990 4.200 3.860 3.950 200,696 -0.04(-1.00%)
Sep 23, 2002 3.500 4.160 3.500 3.990 351,800 +0.14(+3.64%)
Sep 20, 2002 4.400 4.640 3.800 3.850 405,656 -0.47(-10.88%)
Sep 19, 2002 4.440 4.500 4.170 4.320 188,300 -0.19(-4.21%)
Sep 18, 2002 4.200 4.760 4.170 4.510 117,400 +0.27(+6.37%)
Sep 17, 2002 4.650 4.900 4.200 4.240 202,700 -0.28(-6.19%)
Sep 16, 2002 4.850 4.900 4.480 4.520 117,414 -0.38(-7.76%)
Sep 13, 2002 4.700 4.900 4.570 4.900 75,800 +0.15(+3.16%)
Sep 12, 2002 4.900 4.900 4.650 4.750 116,200 -0.05(-1.04%)
Sep 11, 2002 5.120 5.130 4.720 4.800 54,700 -0.18(-3.61%)
Sep 10, 2002 4.930 5.000 4.690 4.980 102,284 +0.11(+2.26%)
Sep 09, 2002 4.990 5.000 4.740 4.870 113,572 -0.13(-2.60%)
Sep 06, 2002 4.801 5.110 4.720 5.000 108,900 +0.25(+5.26%)
Sep 05, 2002 4.840 4.850 4.560 4.750 73,000 -0.10(-2.06%)
Sep 04, 2002 4.650 5.000 4.550 4.850 181,634 +0.20(+4.30%)
Sep 03, 2002 4.950 4.960 4.510 4.650 115,790 -0.29(-5.87%)
Aug 30, 2002 4.650 4.950 4.650 4.940 161,345 +0.13(+2.70%)
Aug 29, 2002 4.720 4.920 4.590 4.810 103,588 +0.18(+3.89%)
Aug 28, 2002 4.730 4.730 4.500 4.630 113,050 -0.12(-2.53%)
Aug 27, 2002 4.710 4.840 4.550 4.750 139,581 -0.08(-1.66%)
Aug 26, 2002 4.700 4.840 4.500 4.830 173,345 +0.13(+2.77%)
Aug 23, 2002 4.800 4.800 4.580 4.700 265,591 -0.10(-2.08%)
Aug 22, 2002 4.850 4.950 4.350 4.800 3,135,900 -0.10(-2.04%)
Aug 21, 2002 4.851 4.970 4.850 4.900 152,085 +0.05(+1.03%)
Aug 20, 2002 4.970 5.000 4.750 4.850 15,960,000 -0.15(-3.00%)
Aug 16, 2002 4.970 5.100 4.700 5.000 301,284 +0.03(+0.60%)
Aug 15, 2002 5.150 5.250 4.710 4.970 209,720 -0.05(-1.00%)
Aug 14, 2002 5.050 5.200 4.600 5.020 399,400 +0.05(+1.01%)
Aug 13, 2002 5.100 5.350 4.810 4.970 601,170 -0.20(-3.87%)
Aug 12, 2002 5.240 5.380 4.800 5.170 87,398 +0.14(+2.78%)
Aug 07, 2002 5.300 5.480 4.730 5.030 333,800 -0.45(-8.21%)
Aug 06, 2002 5.310 5.500 5.110 5.480 292,900 +0.45(+8.95%)
Aug 05, 2002 5.490 5.580 4.770 5.030 255,600 -0.27(-5.09%)
Aug 02, 2002 5.600 5.750 4.990 5.300 204,411 -0.21(-3.81%)
Aug 01, 2002 6.700 6.700 5.500 5.510 335,134 -1.44(-20.72%)
Jul 31, 2002 5.570 6.960 5.000 6.950 1,624,200 +1.38(+24.78%)
Jul 30, 2002 5.160 5.800 5.100 5.570 257,095 +0.46(+9.00%)
Jul 29, 2002 5.030 5.530 5.000 5.110 283,700 +0.01(+0.20%)
Jul 26, 2002 4.950 5.100 4.630 5.100 347,900 +0.18(+3.66%)
Jul 25, 2002 5.150 5.150 4.600 4.920 169,196 -0.16(-3.15%)
Jul 24, 2002 4.690 5.234 4.550 5.080 187,500 +0.38(+8.09%)
Jul 23, 2002 5.460 5.499 4.500 4.700 274,600 -0.50(-9.62%)
Jul 22, 2002 4.300 5.810 4.300 5.200 360,262 +0.84(+19.27%)
Jul 19, 2002 5.520 5.520 4.000 4.360 356,300 -1.69(-27.93%)
Jul 12, 2002 5.991 6.300 5.750 6.050 219,800 +0.05(+0.83%)
Jul 11, 2002 6.050 6.190 5.860 6.000 301,900 +0.08(+1.35%)
Jul 10, 2002 6.360 6.920 5.350 5.920 616,700 -0.33(-5.28%)
Jul 09, 2002 6.581 6.810 6.110 6.250 271,200 -0.33(-5.03%)
Jul 08, 2002 6.750 6.750 6.581 6.581 173,200 -0.24(-3.50%)
Jul 05, 2002 6.250 7.000 6.250 6.820 143,000 +0.44(+6.90%)
Jul 04, 2002 6.050 6.500 5.431 6.380 358,800 +0.00(+0.00%)
Jul 03, 2002 6.050 6.500 5.431 6.380 358,800 +0.28(+4.59%)
Jul 02, 2002 6.770 6.770 6.000 6.100 300,000 -0.71(-10.43%)
Jul 01, 2002 7.280 7.450 6.700 6.810 208,100 -0.72(-9.56%)
Jun 28, 2002 6.840 7.550 6.700 7.530 499,000 +0.49(+6.96%)
Jun 27, 2002 6.420 7.059 6.420 7.040 149,200 +0.62(+9.66%)
Jun 26, 2002 6.000 6.530 5.800 6.420 205,100 +0.29(+4.73%)
Jun 25, 2002 6.410 6.500 6.090 6.130 109,200 -0.34(-5.26%)
Jun 21, 2002 6.650 6.650 6.295 6.470 289,400 +0.27(+4.35%)
Jun 20, 2002 6.630 6.750 6.050 6.200 338,500 -0.44(-6.63%)
Jun 19, 2002 7.000 7.140 6.629 6.640 168,800 -0.39(-5.55%)
Jun 18, 2002 7.100 7.460 7.000 7.030 164,700 -0.08(-1.13%)
Jun 17, 2002 6.500 7.350 6.340 7.110 462,200 +0.76(+11.97%)
Jun 14, 2002 6.100 6.480 5.750 6.350 296,300 +0.23(+3.76%)
Jun 12, 2002 6.100 6.190 5.900 6.120 281,800 +0.03(+0.49%)
Jun 11, 2002 6.290 6.420 5.930 6.090 244,200 -0.25(-3.94%)
Jun 10, 2002 6.400 6.460 6.000 6.340 242,700 -0.01(-0.16%)
Jun 07, 2002 6.450 6.550 6.101 6.350 340,400 -0.08(-1.24%)
Jun 06, 2002 7.500 7.500 6.430 6.430 231,800 -0.97(-13.11%)
Data & News supplied by www.cloudquote.io
Stock quotes supplied by Barchart
Quotes delayed at least 20 minutes.
By accessing this page, you agree to the following
Privacy Policy and Terms and Conditions.