Question

Sodium have 1 valance atom... So it has a tendency to lose 1 electron and obtain neon like configuration... Therefore, it's ELECTRON AFFINITY should be negative becoz it has tendency to lose electron..... Then why it's elctron affinity is postitive??? Plzz explain

Answer 1

Explanation:

Most atoms do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an atom has three or fewer valence electrons, the atom may lose those valence electrons quite easily until what remains is a lower shell that contains an octet. Atoms that lose electrons acquire a positive charge as a result because they are left with fewer negatively charged electrons to balance the positive charges of the protons in the nucleus. Positively charged ions are called cations. Most metals become cations when they make ionic compounds