$$\alpha$$-particle consists of :

2 protons and 2 neutrons only

2 electrons, 2 protons and 2 neutrons

2 electrons and 4 protons only

2 protons only

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Solution

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Correct option is A. 2 protons and 2 neutrons only
$$\alpha $$ - particle is nucleus of Helium which has two protons and two neutrons.
Hence option A is correct answer.

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$$\alpha$$-particle consists of :

Correct option is A. 2 protons and 2 neutrons only$$\alpha $$ - particle is nucleus of Helium which has two protons and two neutrons.Hence option A is correct answer.

Correct option is A. 2 protons and 2 neutrons only
$$\alpha $$ - particle is nucleus of Helium which has two protons and two neutrons.
Hence option A is correct answer.