which of the following statements is NOT true regarding elements on the Periodic Table?
1) elements in 1A and 7A columns are the most reactive due to the number of valence electrons they hold naturally.
2) elements in the second to last (7A) column of the Periodic Table have an unpredictable number of valence electrons.
3) elements in the last (right most) column of the Periodic Table have a full shell of valence electrons.
4) elements in the first two columns of the Periodic Table have only 1 or 2 valence electrons.

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