Question

Out of the elements H(l), Be(4), Na(ll) and Mg(12).
a. Write the pair of elements having similar chemical properties.
b. State the group number of each pair,
c. Name one another element belonging to each of these groups
plz fast

Answer 1

Answer:

a.Be and Mg . H and Na

b. Be and Mg- group 2

H and Na- group 1

c.group 1- K

group 2- Ca

please mark as brainliest

Answer 2

Out of the elements H(l), Be(4), Na(ll) and Mg(12).

Explanation:

a)Chemical properties

They are the properties which comes into notice when one substance  reacts with other substance .

It  depends upon the valency which in turn depends upon valence electrons present in an atom .

Out of the given option : H and Na will somehow some certain similar properties because of same valence electron that is "1".

b)Let us mention the group numbers :

H = Atomic number 1 - E.C =1 , valence electrons =1 , group number =1

Be-atomic number =4 , E.C=2,2, valence electrons =2 , group number 2

Na- atomic number =1 1, E.C =2,8,1 , valence electrons =1 , group number 1 .

Mg -atomic number 12 , E.C =2,8,2 ,Valence electrons =2 , group number 2

c)Element other than these element belonging to same group

The element belonging to the group of Hydrogen : Potassium

The element belonging to the group of Be : Calcium

The element belonging to the group of Na : Potassium

The element belonging to the group of Mg: Calcium