JAMB - Chemistry (2000 - No. 9)
Which of the following statement is correct about the periodic table?
Elements in the same period have the same number of valency electron
The valence electron of the elements in the same period increase progressively across the period
Elements in the same group have the same number of electron shells
The non-metallic properties of the elements tend to decrease across each period
Explicação
The valence electron of the elements in the same period increase progressively across the period due to an increase in atomic number