Question

based on the positions of elements in the periodic table, which of the following groups contains compounds that are most likely to have similar chemical properties?
a kcl, kbr, and ki
b ascl₃, scl₂, and clf
c cf₄, pf₃, and sef₂
d nh₃, h₂o, and hf

Explanation:

Step1: Recall periodic table trends

Elements in the same group (column) of the periodic table have similar chemical properties. Compounds formed from elements in the same group will also show similar chemical behavior.

Step2: Analyze each option

• Option A: \(KCl\), \(KBr\), and \(KI\) are all ionic compounds. \(Cl\), \(Br\), and \(I\) are in Group 17 (halogens). Since they are in the same group, their compounds with \(K\) (Group 1 metal) will have similar chemical properties.
• Option B: \(As\) (Group 15), \(S\) (Group 16), and \(Cl\) (Group 17) are in different groups. Their compounds (\(AsCl_3\), \(SCl_2\), \(ClF\)) will have different chemical properties.
• Option C: \(C\) (Group 14), \(P\) (Group 15), and \(Se\) (Group 16) are in different groups. Their compounds (\(CF_4\), \(PF_3\), \(SeF_2\)) will have different chemical properties.
• Option D: \(N\) (Group 15), \(O\) (Group 16), and \(F\) (Group 17) are in different groups. Their compounds (\(NH_3\), \(H_2O\), \(HF\)) will have different chemical properties.

Answer:

A. \(KCl\), \(KBr\), and \(KI\)