The first one is correct cause first of all it's atomic number is 7 and second of all it's atomic mass is about 15
Answer:
Elements, in turn, are pure substances—such as nickel, hydrogen, and helium—that make up all kinds of matter.
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Notice q=3/2, is half of the original q = 3(<span>1/2</span>)<span>t/28.8
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They both have 1 electron in their valence shell.....
Using a calculator:
(2.568 x 5.8)/4.186 = 3.5581460…
= 3.56 (3sf)
You didn’t specify the correct number of significant figures needed.
