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characteristics of period and groups (don't copy )at least 4 points​

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Answer:

The elements of a group show similar chemical properties but there is a gradual variation in the physical properties of the elements in a group.

characteristic of group .

1.Atomic Size: From top to bottom in a group, the size of atom increases as a new shell to the atom.

2.Valence Electrons(V.E) : Number of valence electrons in a group are same

3.Valency: All elements in a group generally have the same valency

3a. Valency of metal (IA to IIIA)= No. of V.E

3b. Valency of non-metal (IVA to VIIIA)= 8 – No. of V.E

4.Metallic Character: increases from top to bottom in a group.

Characteristics of Periods:

Each period starts with group IA(1) and ends in group VIIIA(0 or 18)

1. Atomic size:

The atomic size decreases from left to right in a period.

Along a period, with increase in atomic number, the number of protons and electrons increases.

So, there is increased force of attraction towards the nucleus. Hence, the atomic size shrinks and decreases.

2.Valence Electrons:

2a.The number of V.Es increases from 1 to 8 along the period.

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