select the correct answer. what is the position of an element in the periodic table if its electron…

select the correct answer. what is the position of an element in the periodic table if its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁵? a. its a group 5a element. b. its a group 6a element. c. its a group 3a element. d. its a group 7a element.

select the correct answer. what is the position of an element in the periodic table if its electron configuration is 1s² 2s² 2p⁶ 3s² 3p⁵? a. its a group 5a element. b. its a group 6a element. c. its a group 3a element. d. its a group 7a element.

Answer

Explanation:

Step1: Determine valence electrons

The valence - shell electrons are in the outermost shell. Here, the outermost shell is the 3rd shell with electrons $3s^{2}3p^{5}$. The number of valence electrons is $2 + 5=7$.

Step2: Relate valence electrons to group

In the periodic table, for main - group elements, the number of valence electrons is equal to the group number in the A - group notation. So, an element with 7 valence electrons is in group 7A.

Answer:

D. It's a group 7A element.