Question

an element "x" has the election configuration 2,8,3 this element is found in ______group and_____period A.3,llla B.llla,3 C.vlla,3 D.va,6​

Answer 1

This element is found in group 3A, period 3

Further explanation

The maximum number of electrons that can be filled in the nth electron shell is 2n²(n=shell)

• K shell (n = 1) maximum 2 x 1² = 2 electrons

• L shell (n = 2) maximum 2 x 2² = 8 electrons
• M shell (n = 3) maximum 2 x 3² = 18 electrons
• N shell (n = 4) maximum 2 x 4² = 32 electrons

Electron configuration of element X : 2.8.3 , so :

K shell = 2 ⇒1s²

L shell = 8⇒2s²2p⁶

M shell = 3⇒ 3s²3p¹

Block p: group 13-18 (has a 2p-6p configuration), also called a representative element because it includes metals, non-metals and metalloids

The outer shell 3s²3p¹ : located in group 3A and period 3

group⇒valence electron ⇒3

period⇒the greatest value of the quantum number n⇒3