Question

members of which group easily lose and electron to form a +1 cation

Answer 1

Members of 1st group elements can lose an electron easily from its valence shell.

Answer 2

Answer: Group 1A

Explanation: Group 1 A elements are elements which contains last electron in s orbital and hence can easily lose one electron and form a cation to attain stable configuration.

The elements include lithium (Li), sodium (Na) , potassium (K), rubidium (Rb) , cesium (Cs) and francium (Fr).

Lithium is an element with atomic number 3 and has 3 electrons which are arranges as:

$Li:3:1s^22s^1$

$Li^+:2:1s^2$