The atom of which of the following elements has only one proton?

Hydrogen

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Helium

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Sodium

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Neon

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Solution

The correct option is A
Hydrogen

In an atom, the number of protons equals its atomic number.
Hence the atom having atomic number one, i.e., Hydrogen (H), has only one proton. Whereas Helium (He), Sodium (Na), and Neon (Ne) have 2, 11, and 10 protons, respectively, because of their corresponding atomic numbers.

Therefore the correct answer is option (A) Hydrogen.

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Similar questions

Which of the following statement is correct about the atom of an element ?

(a) an atom can have only protons and neutrons but no electrons.

(b) an atom can have only electrons and neutrons but no protons

(d) an atom must always have a proton, neutron and electron

Which of the following elements has $17$ electrons and $17$ protons?

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