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alexandr1967 [171]
3 years ago
9

How many neutrons are in a typical silicon atom? A. 15 B. 14 C. 28 D. 42

Chemistry
1 answer:
Aleksandr [31]3 years ago
7 0
Silicon (Si) atomic mass is 28.085.
To find the mass number of most common isotope we need to round atomic mas to wholes.
28.085≈28 is atomic mass
Atomic number(number of protons) is an ordinal number of an element in the Periodic Table.
 For silicons it is 14.
Mass number=number of protons(atomic number)+number of neutrons.
Number of neutrons=Mass number - Number of Protons(atomic number)
Number of neutrons= 28 - 14 = 14

Correct answer is B.14

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