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tacosloco7607
01.10.2019 •
Chemistry
Mercury has an atomic number of 80 and a mass number of 200.
how many neutrons are in one atom of mercury?
a. 40
b. 80
c. 120
d. 200
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Ответ:
Ответ:
The correct answer is Option c.
Explanation:
Atomic number is defined as the number of protons or electrons that are present in a neutral atom.
Atomic number = number of protons = number of electrons
Mass number is defined as the sum of number of protons and number of neutrons present in an atom.
Mass number = Number of neutrons + Number of protons.
We are given:
Atomic number = 80
Mass number = 200
Number of neutrons = Mass number - Atomic number = 200 - 80 = 120
Hence, the correct answer is Option c.
Ответ: