Question

The elements Be,Mg,and Ca are placed in second group of the period table.Their atomic no. are 4,12, and 20 respectively.....

1. Write the electronic configuration of these elements?
2. Write the valency exhibited by them?
3. Which of the 3 elements will be most reactive and why ?
4. Under what conditions do ethanol gets converted to
1. ethene
2. ethane
3. 1,2, dibrommomo ethane..

Answer 1

1. electronic configuration of Be is 4S2 , Mg is 12S2, Ca is 20S2.

2. valency of Be is 2, Mg is 2, Ca is 2.

3. Ca will be the most reactive, as it is placed at the top in the activity series.

Answer 2

1) Be-4=2,2

Mg-12=2,8,2

Ca-20=2,8,8,2

2)Valency:

Be=2,Mg=2 and Ca=2

3)As in reactivity series Calcium(Ca) is

placed above Mg and Be. Thus it is most

reactive.