Question

An atom has two shells and 7 electrons in L shell. Write its electronic configuration, valency and its atomic number. Draw the Bohr diagram of the atom​

Answer 1

The second shell is nothing but the L shell.

Now, since it is give that the atom has only two shell and in that too, L shell contains 7 electrons, this means that the last shell (L shell) contains seven electrons.

First shell (K shell can accommodate a maximum of 2 electrons), thus electronic configuration becomes 2,7.

The element is Fluorine

Atomic number is 9

Valency is -1

Note :- For Bohr diagram, please refer to the attachment.

Answer 2

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