carbon, nitrogen, oxygen, sulfur,selenium, and phosphorus are all in the same group
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Sulphur and helium have entirely different properties. Sulphur has properties similar to group 16 elements. Helium has properties similar to group 18 elements.
Elements in the same group have similar physical and chemical properties.
The elements in a group do not have the same number of shells, however, the elements in a horizontal row do have the same number of shells.
No, they do not. However, elements in the same group have the same number of valence electrons.
Elements with the same number of valence electrons are found in the same group or column of the periodic table. This is because elements in the same group have the same number of valence electrons, which determines their chemical properties. For example, all elements in group 1 have 1 valence electron.