An element S has the proton number 18. The next element in the Periodic Table is an element T.
Which statement is correct?
1 )
Element T has one more electron in its outer shell than element S.
Element T has one more electron shell than element S.
3 )
Element T is in the same group of the Periodic Table as element S.
4 )
Element T is in the same period of the Periodic Table as element S.
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