Which statements about elements in the Periodic Table are correct?
1- Elements in the same group have the same number of electrons in their outer shell.
2- Elements in the same period have the same number of occupied electron shells.
3- The elements are arranged in order of their atomic mass.
4- Every period contains eight elements.
1 and 2
2 )
1 and 3
3 )
2 and 4
4 )
3 and 4
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