Consider an isotope of silicon with a mass number of 30. The number of neutrons

Question

Consider an isotope of silicon with a mass number of 30. The number of neutrons is this isotope of silicon is (a) 14 (b) 16 (c) 28 (d) 34 (e) 44 The element of phosphorus (P) has how many valence electrons? (a) 7 (b) 5 (c) 8 (d) 14 (e) 3 Elements in group 2A(2) of the periodic table form ions with a charge of (a) 1^- (b) 2^- (c) 2^+ (d) 3^+ (e) 6^- What is the correct formula for the oxide ion? (a) O^2 - (b) 0^- (c) 0^+ (d) O^2+ (e) O^3+ What is the correct formula for iron(III) fluoride? (a) Fe_2F_2 (b) FeF (c) FeF_3 (d) Fe_3F_3 (e) Fe_2F_3

Explanation / Answer

Question 18.

isotope of Silicon, Si,

mass number = 30

Mass number = proton + neutrons

the silicon has only 1 proton count = 14

so

neutrons = Mass No- proton = 30-14 = 16

choose B

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