Question

Q2-(5)- The list below represents some elements of the periodic table: Chlorine, Helium, Phosphorus, Magnesium, Cesium

Choose from above and answer the following question:

An element belonging to group VA

Answer 1

Step: 1: Periodic table:

• In the periodic table, there are 18 columns (group) and 7 rows (period). This classification of elements has been done according to their respective physical and chemical properties.
• The period number tells about the number of shells present in a particular element.
• The group number tells about the number of valence electron present in it.
• Valence electron is the number of electrons in the outermost shell

Step: 2: Explanation:

VA means group number 5.

This indicates that the number of valence electrons are 5.

The number of valence electrons in the given elements are:

Elements given	Number of Valence Electron
Chlorine	1
Helium	2
Phosphorus	5
Magnesium	2
Cesium	1

Conclusion: From the table, it is clear that the number of valence electrons is 5 in the case of phosphorus, Hence Phosphorus is belonged to group VA