An atom has a mass number of 30 and 16 neutrons. what is the atomic number of this atom?

The atomic number of an atom is 14.

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 neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons

We are given:

Number of neutrons = 16

Mass number = 30

Number of protons = Atomic number = Mass number - Number of neutrons = 30 - 16 = 14

Hence, the atomic number of an atom is 14.

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

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