I believe the answer would be A. Electronegativity increases across a period.
Neutrons actually don't carry an electrical charge, which is why they are called neutrons because they are "Neutral".
Answer:
C. Lithium
Explanation:
This image describes the trend in reactivity. Group 1 metals are always the most reactive so yeah :)
2.) Average atomic mass =Σ (abundance x molar mass) /100
= (12.64 x 302.04 + 18.23 x 304.12 + 69.13 x 305.03) /100
=304.486 u(Dalton) . This is avg atomic mass.