Atomic number is the number of ___ in an atom

protons

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neutrons

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electrons

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alpha particles

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Solution

The correct option is A
protons

Atomic number is the number of protons in an atom. The number of electrons is only equal to the atomic number in an uncharged atom. In a charged atom, this value changes!

Hence, the only valid answer would be protons here.

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Similar questions

An atomic number is equivalent to the number of protons and neutrons in the atom.

α

α

(a) an atom has equal number of electrons and protons

(b) an atom has equal number of electrons and neutrons

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

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