Question

12. In the atom of an element, elctrons are present in 3 shells. There are 3 electrons in
its outermost shell. mass number of the element is 27.

a)Find the number of electrons and number of neutrons present in the given atom?

b)Draw the Bohr model of this atom
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Answer 1

Answer:

a , No. of electrons is 13 and no. of neutron is 14

it is alluminium which has atomic mass of 27 u.

b, in first shell there are two electrons and in second shell there are 8 electrons and in last shell there are 3 electrons .

valency of atom of alluminium is 3 means to become stable atoms of alluminium have to lose three 3 electrons.

Explanation:

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