Question

physical and chemical properties of 20 elements
plz answer in details​

Answer 1

Answer:

The electronic configuration of Ca(20) is =2,8,8,2

Number of valance electrons =2

The elements with atomic number 12 and 38 both have 2 valence electrons in their outer shell but elements with 19 has 1 valance electron and 21 has 3 valance electrons. Therefore elements with atomic number 12 and 38 have physical and chemical properties resembling calcium.

we have now to write the electronic configurations of all the elements one by one. The electronic configuration of element having atomic number 12 is 2,8,2. It has 2 valence electrons just like calcium. so, element havving atomic number 12 will have physical and chemical properties resembling that of calcium.