Question

6. Write name and electronic
configuration of G2 elements. Why
are they called the alkaline earth
metals?​

Answer 1

Answer:-

Elements of II A are Be(Beryllium) , Mg(Magnesium) , Ca(Calcium) , Sr(Strontium) , Ba(Barium) , Ra(Radium).

II A group elements are called Alkaline earth metals because, the oxides of these metals alkaline(basic) in nature and they exist on the earth's crust. So, they are called as Alkaline earth metals.

Electronic configuration of 2nd A group elements:-

The general Valence shell electronic configuration of II A group elements is ns².

Electronic configuration of all the elements:-

• Be - Z = 4 - 1s² 2s²

• Mg - Z = 12 - 1s² 2s² 2p⁶ 3s²

• Ca - Z = 20 - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

• Sr - Z = 38 - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s²

• Ba - Z = 56 - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s²

• Ra - Z = 88 - 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s².