ICSE Class 10 Chemistry
Question 16 of 30
Periodic Table — Periodic Properties & Variation of Properties — Question 24
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Question Question 24
Explain the trends from metallic to non-metallic character of the different elements in the first three periods.
On moving across a period, nuclear pull increases due to increase in atomic number and thus the atomic size decreases. Hence, the elements cannot lose electrons easily. Therefore, metallic nature decreases across a period moving from left to right and non-metallic character increases.
The alkali metals ( group 1 [IA]) and alkaline earth metals (group 2 [IIA]), placed on the left side of the table are most metallic in nature and the halogens (group 16 [VIA]) placed on the right side of the table are most non-metallic in nature.