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All of the elements in a row (up and down) have the same number of valence electrons so that B, under Al also has 3 elec and I under Cl also has 7 valence electronsRemember that this is only true for VALENCE electrons and not total electronsAlso, for future note, the number of valence electrons for an element is always one bigger than the number of valance elec the element directly on the left hasAlso note that you should consider the metaloids (the elements in the middle) seperately from the rest because then things get complicated with the orbitals
All of the elements in group 7A have 7 valence electronsIf you go by the group you will know how many valence electrons there areGroup 2A has 2 valence electrons and so on.
Boron Electronic configuration - 2, 3 Valence electrons - 3 (outer shell electrons) Total number of electrons - 5 Iodine Electronic configuration - 2, 8, 18, 18, 7 Valence electrons - 7 (outer shell electrons) Total number of electrons - 53
According to scientific reason, electrons are the negatively charged particles which surrounds the necleus inside an atomThe flowing of electrons( negatively charged ions) produces current or electricity.
