Define mass number. What is the mass number of an atom having 6 electrons and 7 neutrons?

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Solution

Mass number is the sum of number of protons and number of neutrons in an atom.
An atom having 6 electrons will have 6 protons as an atom is always neutral.
Therefore,
Mass number = 6 + 7 = 13

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Define mass number. What is the mass number of an atom having 6 electrons and 7 neutrons?

Mass number is the sum of number of protons and number of neutrons in an atom. An atom having 6 electrons will have 6 protons as an atom is always neutral. Therefore, Mass number = 6 + 7 = 13

Mass number is the sum of number of protons and number of neutrons in an atom.
An atom having 6 electrons will have 6 protons as an atom is always neutral.
Therefore,
Mass number = 6 + 7 = 13