An atom of element a has 27 protons. what would the element's atomic number be?

27

Explanation:

The number of protons in atom is the atomic number. For a neutral atom that has not lost or gained any electron, it is the same as the number of electrons.

The atomic number is used in perfect ordering of the periodic table and it is the basis of the periodic law.

Protons are positively charged subatomic particles that reside in the in the nucleus of an atom with the neutrons.

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