use the periodic table to answer the questions: which is the correct electron configuration for sodium (na)…

use the periodic table to answer the questions: which is the correct electron configuration for sodium (na)? 1s²2s²2p⁶2d¹ 1s²2s²2p⁶3s¹ 1s²2p⁶3d³

use the periodic table to answer the questions: which is the correct electron configuration for sodium (na)? 1s²2s²2p⁶2d¹ 1s²2s²2p⁶3s¹ 1s²2p⁶3d³

Answer

Explanation:

Step1: Determine sodium's atomic number

Sodium (Na) has atomic number 11.

Step2: Fill orbitals according to rules

Electrons fill orbitals in order of increasing energy: 1s can hold 2 electrons, 2s can hold 2 electrons, 2p can hold 6 electrons, and then 3s starts to fill. 2 + 2+6 + 1=11. So the electron - configuration is $1s^{2}2s^{2}2p^{6}3s^{1}$.

Answer:

$1s^{2}2s^{2}2p^{6}3s^{1}$ (the second option)