The elements that belong to group 1 of the periodic table are called as _________

(a)

alkali metals

(b)

alkaline earth metals

(c)

chalcogens

(d)

rare gases

Rubidium belongs to______group of metals

(a)

transition

(b)

inner transition

(c)

alkali

(d)

alkaline earth

The radio active element of group 1 is ______

(a)

rubidium

(b)

cesium

(c)

francium

(d)

radium

Half life of francium is _______

(a)

12.3 years

(b)

12.3 mins

(c)

21 years

(d)

21 mins

Electronic configuration of 1s block of elements is ______

(a)

ns²

(b)

ns¹

(c)

ns²np¹

(d)

ns²np²