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a

Element 'x' with electronic configuration (n - 1) d2 ns2 (n = 4) belong to 4th period and 4th group.

b

Element 'y' with electronic configuration (n - 2)f7 (n = 1)d1 ns2 (n = 6) belongs to 6th period and 3rd group and is lanthanide element

c

Element 'z' with electronic configuration ns2 np2 (n = 6) belong to 3rd period and 16th group.

d

All x, y, z elements are metals.

answer is C.

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Detailed Solution

1) 3d24s2(Ti,Z=22), transition element, 4 th period and 4 th group2) 4f75d16s2(La,Z=71), lanthanide element correct 3.3) 6s26p2(Pb,Z=82),6 th period, 14 th group 4) Ti,La and Pb are metals.

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