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Science · 2022 · 2 marks
CBSE 2022 · Region 1 · Set 3 · Q1
Two elements, A and B belong to the 3^rd period of Modern Periodic Table. Element A belongs to Group 1 whereas Element B belongs to Group 16. Compare…
Two elements, A and B belong to the $\displaystyle 3^{\text {rd }}$ period of Modern Periodic Table. Element A belongs to Group $\displaystyle 1$ whereas Element B belongs to Group 16. Compare the following characteristics of A and B, giving justification for each :
(a)
Atomic size
(b)
Metallic character
Marking-scheme solution
(a) • Atomic size of A is greater than atomic size of B - Atomic size decreases in moving from left to right along a period due to increased effective nuclear charge.
(b) • Metallic character of A is more than metallic character of B.
Because the tendency to lose electrons decreases from left to right along a period.
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