Difference between group and periods?
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2. The valence electrons of all elements in the same group are the same.
3. The valency of all the elements in the same group is the same.
4. The size of atoms increases from top to bottom.
5. Metallic reactivity increases and non metallic reactivity decreases from top to bottom.
2. The valence electrons of the elements in the same period increase from left to right.
5. The valency of the elements in the same periods is different.
4. The size of atoms decreases from left to right.
5. Metallic reactivity decreases and non-metallic reactivity increases from left to right.