Why do metals tend to lose electrons and nonmetals tend to gain electrons when forming ions?
Metals have less valence electrons so it is easier to afford away electrons and nonmetals have more valence electrons which makes it easier for them to gain electrons.
Metals tend to lose electrons because they hold less to lose to make a full valence shell. and non metals gain because they simply have to gain a little amount of electrons to cause a full valence shell so they do whats easiest
I would have to say bc the electronegativity of non-metals are greater since electronegativity increases from the gone of the periodic table to the upper right of the periodic table. Also the valence electrons from the the alkali metals and the alkaline dust metals are only two and one. They can easily afford up their electrons to satisfy the octet of a compound when forming an ionic bond. For example like NaCl (the most overstated ionic bond).