Question

an atom of an element x has three electron in its M shell:a)writes its electonic configuration.
b)state the number of protons in one atom of x.c)if the mass Number of x is 27 how many neutrons are present in one atom of x.

Answer 1

Explanation:

In order to overcome the objections raised against Rutherford’s model of the atom, Neil’s Bohr put forward the following postulates about the model of an atom:

(i) Only certain special orbits known as discrete orbits of electrons are allowed inside the atom

Answer 2

Answer: a) 2,8,3

Explanation: M is the third shell

By 2n^2 we get K shell can have 2 electrons, M can have 8 electrons

So it is 2,8,3

b) Total electrons= 2+8+3=13

Electrons=Protons

Number of Protons=13

c) Mass Number= Neutron+Protons

27= Neutron+13

Neutrons = 17