When moving left to right across a period on the Periodic Table, the number of valence electrons increases by one with each element. This is because the atomic number increases, resulting in a higher number of electrons in the outermost shell (valence shell).
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Electrons in the outermost shell are valence electrons!
Gallium (Ga) has 3 valence electrons.
The number of valence electrons remains the same as you move across a row on the periodic table. For example, in row 2 (elements from Li to Ne), all elements have 2 valence electrons. However, the chemical reactivity of these valence electrons can change as you move across the row due to the increasing nuclear charge affecting their interactions with other atoms.
There are 3 valence electrons in an atom of aluminium.
Indium has 3 valence electrons.