Answer:
moving across te periodic table electronegativity increases.
Explanation:
as we move across a period the effective nuclear charge increases as the number of protons in nucleus increases. due to increase in effective nuclear charge electronegativity increases
I think the answer is D. the upper surface of undergound water.
Answer:
Both A and B will be unreactive!
Explanation:
10=2, 8
18=2, 8, 8
