Question

Out of the elements H1,Be4,Na11,and Mg12, write the pair of elements having similar chemical properties

Answer 1

Answer:

the pair is Be4 and Mg12

Explanation:

• Be and Mg are in same group(alkali earth metals)
• both have valency +2
• both are metals

Answer 2

Out of the elements H1,Be4,Na11,and Mg12, the pair of elements having similar chemical properties: Be and Mg.

Explanation:

Periodic table

1. It is the classification of elements in a tabular manner in order to make the study easier .
2. The modern periodic table is world wide accepted and is given by Bohr .
3. According to it , periodicity of properties is due to repetition of similar electronic configuration after regular intervals  .
4. The modern periodic table is divided into :

Groups : vertical rows

Periods : Horizontal rows

The elements in same group have same valence electrons and therefore they have same chemical properties .

Like , in Be and Mg : they have 2 valence electrons .They belong to same group 2 , therefore same chemical properties .