Question

Sulfur (S) has an atomic number of 16. What is the ground-state electron configuration of sulfur?

O1s²1p62s²2p6
O1s²2s²2p 3s²3p4
O1s²2s²2p62d6
O 1s²1p61d7

Answer 1

It's B

Step-by-step explanation:

at ground state the atomic number or proton number is equal to the electron number

Normally

the trend for electronic configuration goes as

1s² - 2S² - 2P⁶ -3S² - 3P⁶ -4S² - 3D¹⁰ and so on

(with each number representing a particular energy level and we go from lower to higher energy level)

but for this case we have sulfur

so we go from

1s² - 2S² - 2P⁶ - 3S² - 3P⁴ (I think that was what was supposed to be there not just 2P)

you fill from the lowest energy level to the highest and stop filling when you run out of electrons

since we only had 16 electrons I stopped at 3P⁴