Q.

The atomic number of hydrogen is 1. This implies that it contains                in its K- shell.

A. One neutron
B. One proton
C. One electron
D. None of the above
Answer» C. One electron
Explanation: This implies that Hydrogen has one electron in its K shell. Also, it requires one more electron to fill the K shell. So two hydrogen atoms share their electrons to form a molecule of hydrogen, H2.
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