Question

SECTION A
1. The atomic numbers of three elements X, Y and Z are 5, 13 and 17, respectively. State giving
reason which two elements will show similar chemical properties?
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Answer 1

Answer:

x and y

Explanation:

because there valence is same

Answer 2

Explanation:

Electronic configuration of X- 2,3

Electronic configuration of Y- 2,8,3

Electronic configuration of Z- 2,8,7

X,Y have same valence electrons in outer shell so they are likely to have same chemical properties