Why is radioactive decay considered an exponential process

It breaks down in mathematically exponential way.

Explanation:

For example if you have 100 grams, after the first decay, its 50. Then 25. Then 12.5, and so on. Rather than, say, 5 grams being subtracted every cycle, it is dilated by the factor of a fraction, making it exponential.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.