આવર્ત કોષ્ટકના ચોથા આવર્તમાં, કેટલા તત્વોમાં એક અથવા વધુ $4\,d$ ઇલેક્ટ્રોન હોય છે?
A$2$
B$18$
C$0$
D$6$
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c In fourth period of periodic table, There is no element having one or more \(4 d\) electron.
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