How many hydrogen atoms are in the following molecule of ammonium sulfide? (NH4)2S a. 2
b. 4
c. 8
d. 16

Explanation:

There are "2 parts" to the molecule S(NH₄)₂

Let's focus on the ammonium, since it contains the hydrogen.

There is 1 Nitrogen atom (no subscript) and 4 hydrogen atoms ( subscript of 4).

But, this is only for 1 molecule of ammonium. If we look back at the original molecule, there is a subscript of 2 around (NH₄). This indicates there are 2 molecules of ammonium.

There are 4 hydrogen atoms in 1 molecule. So, to find the number in 2 molecules, simply multiply 4 by 2.

There are 8 hydrogen atoms in S(NH₄)₂

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.