strontium

Ms. Maxt
** the element strontium ** · Element name- strontium · Symbol name- Sr · Atomic number- 38 · Atomic mass- 87. 62 · Number of protons- 38 .Number of neutrons- 50 · Number of electron- 38 · Electron c .configuration-[Kr] 5s 2
 * __Basis information__ **

Physical
Strontium is chemical solid; it stays in group 2 and period 5. Strontium will turn liquid at temperature 770 °C and turn gas at temperature 1380 °C

Chemical
When you put strontium in air with normal temperature, strontium will make a layer little yellow that is result of strontium when it stays in normal air. When you put strontium in the humidity

history
strontium was discover by Adair Crawford in 1790. he was recognised that the Strontian ores exhibited different properties to those normally seen with other "heavy spars" source

Isotopes of strontium
The alkali earth meal strontium has four stable, naturally occurr  isotopes: 84Sr (0.56%), 86Sr (9.86%), 87Sr (7.0%) and 88Sr (82.58%). It has a standard atomic mass of 87.62(1) .Sixteen unstable isotopes are known to exist. Of greatest importance are strontium-89 with a haft-life  of 50.57 days, and strontium-90 (90Sr) with a half-life of 28.78 years. They decay by emitting an element and an anti- neutrinoin beta decay (β− decay)



table
symbol ||~ Z([|p]) ||~ N([|n]) ||~ isotopic mass (u) ||~ half-life ||~ nuclear spin ||~ representative isotopic composition (mole fraction) ||~ range of natural variation (mole fraction) ||
 * ~ uclide
 * ^  ||||||~ excitation energy ||
 * 73Sr ||> 38 ||> 35 || 72.96597(64)# || >25 ms || 1/2-# ||  ||   ||
 * 74Sr ||> 38 ||> 36 || 73.95631(54)# || 50# ms [>1.5 µs] || 0+ ||  ||   ||
 * 75Sr ||> 38 ||> 37 || 74.94995(24) || 88(3) ms || (3/2-) ||  ||   ||
 * 76Sr ||> 38 ||> 38 || 75.94177(4) || 7.89(7) s || 0+ ||  ||   ||
 * 77Sr ||> 38 ||> 39 || 76.937945(10) || 9.0(2) s || 5/2+ ||  ||   ||
 * 78Sr ||> 38 ||> 40 || 77.932180(8) || 159(8) s || 0+ ||  ||   ||
 * 79Sr ||> 38 ||> 41 || 78.929708(9) || 2.25(10) min || 3/2(-) ||  ||   ||
 * 80Sr ||> 38 ||> 42 || 79.924521(7) || 106.3(15) min || 0+ ||  ||   ||
 * 81Sr ||> 38 ||> 43 || 80.923212(7) || 22.3(4) min || 1/2- ||  ||   ||
 * 82Sr ||> 38 ||> 44 || 81.918402(6) || 25.36(3) d || 0+ ||  ||   ||
 * 83Sr ||> 38 ||> 45 || 82.917557(11) || 32.41(3) h || 7/2+ ||  ||   ||
 * 83mSr |||||| 259.15(9) keV || 4.95(12) s || 1/2- ||  ||   ||
 * 84Sr ||> 38 ||> 46 || 83.913425(3) || STABLE || 0+ || 0.0056(1) || 0.0055-0.0058 ||
 * 85Sr ||> 38 ||> 47 || 84.912933(3) || 64.853(8) d || 9/2+ ||  ||   ||
 * 85mSr |||||| 238.66(6) keV || 67.63(4) min || 1/2- ||  ||   ||
 * 86Sr ||> 38 ||> 48 || 85.9092602(12) || STABLE || 0+ || 0.0986(1) || 0.0975-0.0999 ||
 * 86mSr |||||| 2955.68(21) keV || 455(7) ns || 8+ ||  ||   ||
 * 87Sr ||> 38 ||> 49 || 86.9088771(12) || STABLE || 9/2+ || 0.0700(1) || 0.0694-0.0714 ||
 * 87mSr |||||| 388.533(3) keV || 2.815(12) h || 1/2- ||  ||   ||
 * 88Sr ||> 38 ||> 50 || 87.9056121(12) || STABLE || 0+ || 0.8258(1) || 0.8229-0.8275 ||
 * [|89Sr] ||> 38 ||> 51 || 88.9074507(12) || 50.57(3) d || 5/2+ ||  ||   ||
 * [|90Sr] ||> 38 ||> 52 || 89.907738(3) || 28.90(3) a || 0+ ||  ||   ||
 * 91Sr ||> 38 ||> 53 || 90.910203(5) || 9.63(5) h || 5/2+ ||  ||   ||
 * 92Sr ||> 38 ||> 54 || 91.911038(4) || 2.66(4) h || 0+ ||  ||   ||
 * 93Sr ||> 38 ||> 55 || 92.914026(8) || 7.423(24) min || 5/2+ ||  ||   ||
 * 94Sr ||> 38 ||> 56 || 93.915361(8) || 75.3(2) s || 0+ ||  ||   ||
 * 95Sr ||> 38 ||> 57 || 94.919359(8) || 23.90(14) s || 1/2+ ||  ||   ||
 * 96Sr ||> 38 ||> 58 || 95.921697(29) || 1.07(1) s || 0+ ||  ||   ||
 * 97Sr ||> 38 ||> 59 || 96.926153(21) || 429(5) ms || 1/2+ ||  ||   ||
 * 97m1Sr |||||| 308.13(11) keV || 170(10) ns || (7/2)+ ||  ||   ||
 * 97m2Sr |||||| 830.8(2) keV || 255(10) ns || (11/2-)# ||  ||   ||
 * 98Sr ||> 38 ||> 60 || 97.928453(28) || 0.653(2) s || 0+ ||  ||   ||
 * 99Sr ||> 38 ||> 61 || 98.93324(9) || 0.269(1) s || 3/2+ ||  ||   ||
 * 100Sr ||> 38 ||> 62 || 99.93535(14) || 202(3) ms || 0+ ||  ||   ||
 * 101Sr ||> 38 ||> 63 || 100.94052(13) || 118(3) ms || (5/2-) ||  ||   ||
 * 102Sr ||> 38 ||> 64 || 101.94302(12) || 69(6) ms || 0+ ||  ||   ||
 * 103Sr ||> 38 ||> 65 || 102.94895(54)# || 50# ms [>300 ns] ||  ||   ||   ||
 * 104Sr ||> 38 ||> 66 || 103.95233(75)# || 30# ms [>300 ns] || 0+ ||  ||   ||
 * 105Sr ||> 38 ||> 67 || 104.95858(75)# || 20# ms [>300 ns] ||  ||   ||   ||