Question

read each description in the first column of the table below. if any chemical element with atomic number of 92 or less matches the description, check yes and enter the chemical symbol of an element that matches. otherwise check no in the second column.

description	does any element with z ≤ 92 match the description?	if you checked yes, give the symbol of an element with z ≤ 92 that matches.
a metalloid in group 8a.	∘ yes ∘ no
an element in the nitrogen family with a lower atomic number than strontium.	∘ yes ∘ no
a transition element in period 2.	∘ yes ∘ no

Explanation:

1. An element in Period 4 and Group 8A.

Step1: Recall Periodic Table structure

Period 4 has elements with principal quantum number \( n = 4 \). Group 8A (noble gases) has elements with valence electron configuration \( ns^2np^6 \).

Step2: Identify the element

In Period 4, Group 8A, the element is Krypton (Kr). Atomic number of Kr is 36, which is \( \leq 92 \).

Step1: Recall Group 8A elements

Group 8A elements are noble gases (He, Ne, Ar, Kr, Xe, Rn).

Step2: Check if any is a metalloid

Noble gases are non - metals, not metalloids. So no element in Group 8A is a metalloid.

Step1: Recall nitrogen family and strontium's atomic number

Nitrogen family (Group 15) has elements N, P, As, Sb, Bi. Atomic number of strontium (Sr) is 38.

Step2: Identify elements in nitrogen family with \( Z < 38 \)

N (7), P (15), As (33) have atomic numbers less than 38. For example, P (Phosphorus) has atomic number 15.

Answer:

Does any element with \( Z \leq 92 \) match the description? Yes
If you checked yes, give the symbol of an element with \( Z \leq 92 \) that matches: Kr

2. A metalloid in Group 8A.