An atom has 18 protons, 18 electrons, and 20 neutrons. This atom has _____.

A) a negative charge B)an atomic number of 20 C)a mass number of 38 D) a positive charge

Which one of these is the answer?

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Solution

No. of protons is equals to the no. of electrons so, it is a neutral atom.

Atomic No. = Mass No. $-$ No. of neutrons

Atomic No. = No. of protons = 18

Mass No. = Atomic No. + No. of Neutrons= 18 + 20 = 38

Hence, the correct option is C.

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An atom has 18 protons, 18 electrons, and 20 neutrons. This atom has _____. A) a negative charge B)an atomic number of 20 C)a mass number of 38 D) a positive charge Which one of these is the answer?

No. of protons is equals to the no. of electrons so, it is a neutral atom.Atomic No. = Mass No. − No. of neutronsAtomic No. = No. of protons = 18Mass No. = Atomic No. + No. of Neutrons= 18 + 20 = 38Hence, the correct option is C.

An atom has 18 protons, 18 electrons, and 20 neutrons. This atom has _____.

A) a negative charge B)an atomic number of 20 C)a mass number of 38 D) a positive charge

Which one of these is the answer?

No. of protons is equals to the no. of electrons so, it is a neutral atom.

Atomic No. = Mass No. $-$ No. of neutrons

Atomic No. = No. of protons = 18

Mass No. = Atomic No. + No. of Neutrons= 18 + 20 = 38

Hence, the correct option is C.