How is hydrogen atom different from atoms of all other elements?

It has two electrons and one proton

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It has no electrons

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It has two protons

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It does not contain any neutron

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Solution

The correct option is D It does not contain any neutron
All atoms are made up of three subatomic: electrons, protons and neutrons. A hydrogen atom has one electron and one proton. It does not contain any neutron. The absence of neutrons make it different from other atoms.

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(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

An atom has an atomic number of 19 and a mass number of 39. How many electron ,protons and neutrons does it have?

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