Question

given below are some elements of modern parodic table. atomic number of the element is given below . A(4) B(9) C(14) D(19) E (20) (1) which element has one electron in outer most shell. write its electronic configuration. (2) which is two elements belong to same group (3) which of two elements belong to same period which one has higher atomic radii?

Answer 1

Heya Frnd.........☺

1 ) element D , (EC = 2,8,8,1)

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2 ) element A & D ....... ( no. of electrons in last shell are equal = 2)

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3 ) A & B ( A has larger atomic radii)
D & E ( D has larger atomic radii)

✴ Reason : - The element which lies left in the period has bigger atomic radii.
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