Question

The elements Z=117 and 120 have not yet been discovered. in which family/ group would you place these elements and also give the electronic configuration in each case

Answer 1

Given :
Atomic number z=117
Number of protons=117
electronic configuration is [Rn]5f¹⁴6d¹⁰7s²7p⁵
Belongs to group 17-- Halogen Family
11) atomic number =z=120
number of protons= 120
so, electronic configuration is [Uuo]8s²
element belongs to group 2 ---Alkali earth family.

Answer 2

Answer: Element with atomic number 117 will belong to group 17 and the element with atomic number 120 will belong to group 2.

Explanation:

• Element with atomic number 117 has 117 electrons only.

The electronic configuration of $Z=117:[Rn]7s^25f^{14}6d^{10}7p^5$.

The number of valence electrons of this element are 7 and thus will belong to the Group 17.

• Element with atomic number 120 has 120 electrons only.

The electronic configuration of $Z=120:[Uuo]8s^2$.

The number of valence electrons of this element are 2 and thus will belong to the Group 2.