what
is its atomic number?
(a) 25
(b) 26 (c) 27 (d) 24
Answer:
(b)
Electronic configuration of 
is 
It repersents the
total number of 
and oxidation
state,
Therefore,
atomic number of X = 18 + 5 + 3 = 26
Hence, option (b) is
correct.
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