State which of the following is correct :

A neutral atom, atomic number 33 and atomic mass 75, contains :

(1) 75 neutrons
(2) 42 electrons
(3) 33 protons

If 1, 2 and 3 are correct

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If only 1 and 2 are correct

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If only 2 and 3 are correct

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If only 1 is correct

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If only 3 is correct

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Solution

The correct option is D If only 3 is correct

In a neutral atom, the number of protons in the nucleus is equal to the atomic number (Z).

The number of electrons is equal to the number of protons and when the atomic number is subtracted from the mass number gives the number of neutrons.

Thus the number of proton $= 33$ ,

Number of electron $= 33$

Number of neutron $= 75 - 33 = 42$

Hence the correct option is E.

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State which of the following is correct :A neutral atom, atomic number 33 and atomic mass 75, contains :(1) 75 neutrons(2) 42 electrons(3) 33 protons

State which of the following is correct :

A neutral atom, atomic number 33 and atomic mass 75, contains :

(1) 75 neutrons
(2) 42 electrons
(3) 33 protons