Question

identify which of the following elements has the highest metallic character in the following group 15 elements. * (0.5 points)
n
p
sb
as
11
which elements are considered to be metalloids?
i. gallium
ii. germanium
iii. arsenic * (0.5 points)
ii and iii only
i and ii only
i, ii and iii
i and iii only

Explanation:

• For the first question: Metallic character increases down a group. Among group 15 elements \(N\), \(P\), \(As\), \(Sb\), \(Sb\) is the lowest - placed in the group (as \(N\) is in period 2, \(P\) in period 3, \(As\) in period 4, and \(Sb\) in period 5). So \(Sb\) has the highest metallic character.
• For the second question: Metalloids are elements that have properties intermediate between metals and non - metals. Gallium (\(Ga\)) is a metal. Germanium (\(Ge\)) and Arsenic (\(As\)) are metalloids.

Answer:

• First question: Sb
• Second question: II and III only