Half of a sample of cobalt-60 decays after 5.26 years to form atoms of another element. half of a sample of iodine-131 decays after 8.1 days to form atoms of another element. which best explains this difference? 1choice 1 iodine-131 has a smaller atomic number than cobalt-60. 2choice 2 iodine-131 has a shorter half-life than cobalt-60. 3choice 3 iodine-131 has a smaller atomic mass than cobalt-60. 4choice 4 iodine-131 has half the radioactive energy of cobalt-60.

Iodine-131 has a shorter half-life than cobalt-60.

We are given;

We are supposed to explain the difference between the two instances;

We need to define half life;

hloride, what is the mass of calcium in

explanation:

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.