Which of the following statements is always correct?

Question:

Which of the following statements is always correct?

(a) An atom has equal number of electrons and protons.

(b) An atom has equal number of electrons and neutrons.

(c) An atom has equal number of protons and neutrons.

(d) An atom has equal number of electrons, protons and neutrons.

Solution:

(a) The number of electrons or protons in an atom are always equal.

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