Question

Moseley saw gaps in the new periodic table. He predicted the existence of 4 new elements
A) technetium
B) promethium
C) hafnium
D) rhenium Which of the above elements was/were discovered?
A) (a) and (b)
B) (a) and (c)
C) (a), (b), (c), (d)
D) (a), (b), (c) ​

Answer 1

Answer:

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