Question

Out of the elements H(1), Be(4), Na(11), and Mg(12).
1. Write the pair of elements having similar chemical properties.
2. State the group no. of each pair
3. Name the another element belonging to each of these groups.

Answer 1

1. Na and H

Be and Mg

2. na and h = 1

be and mg = 2

3. 1 = h,li,na,k,rb,cs,fr

2= be,mg,ca,sr,ba,ra

Answer 2

Out of the elements H(1), Be(4), Na(11), and Mg(12).

1. The pair of elements having similar chemical properties are Na and Mg.

2. The group no. of each pair  is H and Na belongs to group 1 and Be and Mg belongs to group 2.

3. Name the another element belonging to each of these groups is Li belongs to group 1 and calcium belongs to group 2.

Explanation:

• When elements tend to contain same number of valence electrons then they tend to show similar chemical reactivity. For example, electronic configuration of He is $1s^{1}$.

• Electronic configuration of Be is $1s^{2}2s^{2}$, Na is $1s^{2}2s^{2}2p^{6}3s^{1}$. Mg is $1s^{2}2s^{2}2p^{6}3s^{2}$. Since, only Be and Mg contains same number of valence electrons therefore they tend to show similar chemical properties.

• Both hydrogen (H) and sodium (Na) belongs to group 1 whereas both beryllium (Be) and magnesium (Mg) belongs to group 2. Lithium is another element which belongs to group 1 and calcium is another element that belongs to group 2 of the periodic table.

Learn more about chemical properties:

https://brainly.in/question/11941187

https://brainly.in/question/641287

#Learnwithbrainly