Explanation:
the best way to understand the age of the earth is to estimate the age of matirials in it
Se2- has 34 protons and 36 electrons so it gets a 2- charge.
<span>Answer:
Correct answers are- Electron affinity decreases; Cl has 7 valence electrons but Na has only 1. So Na is going to lose its e, Cl is going to gain an e.</span>
