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Lelu [443]
3 years ago
11

In which of the following is the number of neutrons correctly represented? A. fluorine: atomic number 9, mass 19, neutrons 0 B.

arsenic: atomic number 33, mass 75, neutrons 108 C. magnesium: atomic number 12, mass 24, neutrons 24 D. uranium: atomic number 92, mass 238, neutrons 146
Chemistry
2 answers:
Digiron [165]3 years ago
4 0
D. uranium: atomic number 92, mass 238, neutrons 146

238-92=146
earnstyle [38]3 years ago
3 0

<u>Answer:</u> The correct answer is Option D.

<u>Explanation:</u>

Atomic number is defined as the number of protons that are present in an atom. It is represented as Z.

Z = Atomic number = Number of protons

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.  It is represented as A.

A = Mass number = Number of protons + Number of neutrons

For the given options:

  • <u>Option A:</u> Fluorine

Atomic number = 9

Mass number = 19

Number of neutrons = 19 - 9 = 10

Thus, the number of neutrons are not represented correctly.

  • <u>Option B:</u> Arsenic

Atomic number = 33

Mass number = 75

Number of neutrons = 75 - 33 = 42

Thus, the number of neutrons are not represented correctly.

  • <u>Option C:</u> Magnesium

Atomic number = 12

Mass number = 24

Number of neutrons = 24 - 12 = 12

Thus, the number of neutrons are not represented correctly.

  • <u>Option D:</u> Uranium

Atomic number = 92

Mass number = 238

Number of neutrons = 238 - 92 = 146

Thus, the number of neutrons are represented correctly.

Hence, the correct answer is Option D.

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