Bohr models of at

a.

Here number of protons = the number of electrons = 6

Since, atomic number of an atom = the number of protons

Hence the atomic number of the atom = 6

We know that mass number = number of protons + number of neutrons

∴ Mass number = 6 + 6 =12

Electronic configuration of the atom : -

K shell - 2 electrons

L shell – 4 electrons

Here number of protons = the number of electrons = 7

Since, atomic number of an atom = the number of protons

Hence the atomic number of the atom = 7

We know that mass number = number of protons + number of neutrons

∴ Mass number = 7 + 8 =15

Electronic configuration of the atom : -

K shell - 2 electrons

L shell – 5 electrons

Here number of protons = the number of electrons = 6

Since, atomic number of an atom = the number of protons

Hence the atomic number of the atom = 6

We know that mass number = number of protons + number of neutrons

∴ Mass number = 6 + 8 =14

Electronic configuration of the atom : -

K shell - 2 electrons

L shell – 4 electrons

Here number of protons = the number of electrons = 8

Since, atomic number of an atom = the number of protons

Hence the atomic number of the atom = 8

We know that mass number = number of protons + number of neutrons

∴ Mass number = 8 + 8 =16

Electronic configuration of the atom: -

K shell - 2 electrons

L shell – 6 electrons

b). Isotopes – These are the chemical species having the same atomic number but different mass numbers.

In the above given atoms A and C have the same atomic number and differ only in the matter of number of neutrons present in their respective nucleus.

Hence, atom A and C are isotopes.