Essential Chemistry for IGCSE - Atoms, Elements And Compounds (Section 2 - No. 44)
What do elements in the same group (vertical column) of the periodic table have in common?
The same atomic number.
The same number of electron shells.
The same number of valence electrons.
The same mass number.
Explanation
Elements in the same group have the same number of valence electrons, leading to similar chemical properties.
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