SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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If an atom contains 4 protons, 4 neutrons, and 4 electrons. What is its mass number?
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4
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8
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2
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16
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Explanation:
Detailed explanation-1: -The sum of the number of neutrons and protons in an atom of the element is called a mass number of an atom. Lithium contains 3 electrons, 4 neutrons, and 3 protons. Mass number (A) = Number of Proton + Number of Neutron. Mass number (A) = 3 + 4 = 7.
Detailed explanation-2: -Mass number = number of proton + number of neutron =4+5=9.
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