Question

which compound will most likely form when an element in group 1 reacts with an element in group 17?
a sulfuric acid, h₂so₄
b calcium fluoride, caf₂
c hydrochloric acid, hcl
d hydrogen sulfide, h₂s

Explanation:

1. Analyze the groups: Group 1 elements (alkali metals) have a +1 charge, Group 17 elements (halogens) have a -1 charge.
2. Analyze each option:

• Option A: \(H_2SO_4\) contains S (Group 16), O (Group 16), and H (Group 1), no Group 17 element. Eliminate.
• Option B: \(CaF_2\): Ca is Group 2 (charge +2), F is Group 17 (charge -1). The compound is formed from Group 2 and 17, not Group 1 and 17. Eliminate.
• Option C: \(HCl\): H is Group 1 (charge +1), Cl is Group 17 (charge -1). They combine in a 1:1 ratio, forming \(HCl\), which matches Group 1 and Group 17 element reaction.
• Option D: \(H_2S\): H is Group 1, S is Group 16. No Group 17 element. Eliminate.

Answer:

C. hydrochloric acid, \(HCl\)