An atom of deuterium, one of the elemental isotopes of hydrogen contains:

1 electron, 1 proton and 2 neutrons

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1 electron, 1 proton and 1 neutron

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1 electron, 2 protons and 1 neutron

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1 electron, 2 protons and 2 neutrons

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Solution

The correct option is B 1 electron, 1 proton and 1 neutron
Hydrogen has three isotopes, protium, deuterium and tritium.
A hydrogen atom that contains 1 electron, 1 proton and 1 neutron is called deuterium.
Deuterium reacts with oxygen to form a compound called deuterium oxide ( $D_{2} O$ ) which is also known as heavy water.

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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

(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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