Question

ans.... all 5.... ....​

Answer 1

HEYA GM ❤

# ELEMENTS...

1} Ca -----> 1s² 2s² 2p^6 3s² 3p^6 4s²

2} No. of Valence electrons in RB ( RUBIDIUM ) = 1

3} No. of shells in SR ( STRONTIUM ) = 9

4} K ( POTASSIUM ) Is a Metal.... BCOZ it has Tendency to RELEASE (H+) ion.... when Dissolved in Acidic Medium...

5} Largest size among it ... is of SR ( STRONTIUM )

6} BE < MG < CA < RB

THANK YOU..... ❤