Question

THE ELEMENT X IN GROUP 17 HAS 3SHELLS. IF SO,
a)write the subshell electronic configuration of the element
b)write the period number
c) write any two property of this element

Answer 1

Answer:

Elements in the same period have the same number of electron shells; moving across a period (so progressing from group to group), elements gain electrons and protons and become less metallic. This arrangement reflects the periodic recurrence of similar properties as the atomic number increases.

Answer 2

Answer:

The element is chlorine

a)$1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}$

b)3rd period

c)Chlorine has a characteristic penetrating and irritating odor. The gas is greenish yellow in color and the liquid is clear amber.