Which pair of elements have the same amount of valence electrons lithium, beryllium, sodium, magnesium

What is limiting reactant? with examples

Which form of relativism states that people rely on their own standards of right and wrong when making a decision?

An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d