Question

The atomic number of an element is 12 and atomic mass is 25. State the number of electrons, protons and neutrons​

Answer 1

Answer:

electron = 12

proton=12

neutron=12

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Answer 2

Answer:

Electronic configuration of an element having atomic number=25 is [Ar]4s

2

3d

5

. So the most stable oxidation state is +2 which results in the removal of two 4s electrons leaving an ion in which all five of 3d orbitals contain single electron. So the most stable ion contains 23 electrons.

A number of protons are equal to its atomic number i.e., 25.

Atomic mas = Number of protons + Number of neutrons

55=25 + Number of neutrons

Number of neutrons=30