Question

part a
which pair of elements do you expect to be most similar?
ge and ga
ar and br
ti and ga
n and o
li and na

Explanation:

Step1: Recall periodic table trends

Elements in the same group (vertical column) have similar properties.

Step2: Analyze each pair

• Ge (Germanium, Group 14) and Ga (Gallium, Group 13): Different groups.
• Ar (Argon, Group 18) and Br (Bromine, Group 17): Different groups.
• Ti (Titanium, Group 4) and Ga (Gallium, Group 13): Different groups.
• N (Nitrogen, Group 15) and O (Oxygen, Group 16): Different groups.
• Li (Lithium, Group 1) and Na (Sodium, Group 1): Same group.

Answer:

Li and Na