which of the following is an element?
A.Na
B.Fe
C.Pz
D.He
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which of the following is an element?
A.Na
B.Fe
C.Pz
D.He
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Answer:
A.Na
Explanation:
It's sodium
Answer:
D.He
Element of System:
The transition elements or transition metals occupy the short columns in the center of the periodic table, between Group 2A and Group 3A. They are sometimes called the d-block elements, since in this region the d-orbitals are being filled in, and are also referred to as B-group elements since in most numbering systems of the columns on the periodic table the numerals of these groups are followed.
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