Question

There are three shells in the atom of element X . Three electrons are present in its outer shell
a) write the electronic configuration of element X
b) what is its atomic number
c) In which period and group does this element belongs to​

Answer 1

Answer:

a) 2,8,3

b) atomic no.=13

c) this element is Aluminium(Al)

(please refer to periodic table for period and group)

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Answer 2

$\sf a) \: \: (2,8,3)$

$\sf b) \: \: Atomic \: \: number \: \: \implies \: \: \: 13$

$\sf c) \: \: Period \: \: \implies \: \: 3 \\ \sf Group \implies \: \: 13$

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