Question

Only certain special orbits known as discrete orbits of electrons are allowed inside

the atom. While revolving in discrete orbits the electrons do not radiate energy. Neutrons

are present in the nucleus of all atoms, except hydrogen. In general, a neutron is

represented as 'n The mass of an atom is therefore given by the sum of the masses of

protons and neutrons present in the nucleus. The maximum number of electrons present in

a shell is given by the formula 2n2, where 'n ' is the orbit number or energy level index, 1, 2,

3…..Electrons are not accommodated in a given shell unless the inner shells are filled.

i. Who discovered a subatomic particle which had no charge and a mass nearly equal to

that of a proton?

a. Ernest Rutherford

b. Thomson

c. J. Chadwick

d. Neils Bohr

ii. The maximum number of electrons that can be accommodated in the outermost orbit

a. 8

b. 9

c. 5

d. 2
Electronic configuration of phosphorus is

a. 2, 8,1

b.2,8,2

c.2,8,5

d.2,7

v. The total number of the electron that can be accommodated in the third orbit or M- shell

is

a. 18

b. 17

c. 16

d. 15​

Answer 1

Answer:

i) c. J. Chadwick

ii) a.8

iv) c.2,8,5

v) a. 18

Explanation:

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