Which statements describe changes that occur from left to right across a period of the Periodic Table?
1 The atomic number of the elements increases.
2 The metallic character of the elements decreases.
3 The physical state of the elements changes from gas to solid.
1 )
2 only
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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