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CBSE Class 9 Answered

(a) Draw a sketch of Bohr's model of an atom with two shells completely filled with electrons. (b) Name sub-atomic particles of an atom with (i) positive charge (ii) without any charge. (c)What is the valency of Aluminium whose atomic number is 13? Give reason.
Asked by Topperlearning User | 05 May, 2015, 10:55: AM
answered-by-expert Expert Answer

(a) Bohr's model:

 

(b) (i) Proton (ii) Neutron

(c) Valency of Al = 3

Electronic configuration of Al = 2, 8, 3

Since Al has 3 valence electrons in its outer most shell; so its valency is 3.

Answered by | 05 May, 2015, 12:55: PM
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