Electron configuration....?

Question

Which of the following has/have the electron configuration [Ne] 3s2 3p6?
i. S2-
ii. Cl
iii. Ar
iv. K+
v. Ca2+

p/s: wat does [Ne] stand for?

Answer 1

The answer is iii. Ar.

You need to brush up or learn your electron orbitals more to gain a better understanding of what this means. "Ne" refers to Neon. It's an abbreviation. Instead of saying "1s2 2s2 2p6 3s2 3p6" it's just being abbreviated as "Ne 3s2 3p6" because Neon has an electron orbital configuration of 1s2 2s2 2p6. Please learn what each orbital is and how many electrons it holds, then you'll grasp this better.

I am providing a link below that discusses the periodic table and electron orbitals.

Answer 2

Ar, K+ & Ca2+

[Ne] stands for Neon, often it becomes difficult to write the e.config. of elements of high atomic nos, in those case this abbv. is used. It stands for the e.config of the element is of the inert gas written in bracketts + the e.s that r written in the right side of it.

Answer 3

iii. Ar
iv. K+
v. Ca2+

Ne stands for Neon. It is one of the noble gases.