Element Y is in the second Period of the Periodic Table. An atom of element Z has six more protons than an atom of element Y.
Which statement must be correct?
1 )
Elements Y and Z are in the same Period.
Elements Y and Z have the same number of electrons in the first shell.
3 )
Element Z has six more electrons in its outer shell than element Y.
4 )
The nucleon number of element Z is six more than that of element Y.
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