Which of the following represents the correct decreasing order of metallic character for the elements N, B, Al, Mg, and K?

Step-by-step solution

Metallic character is the tendency of an element to lose electrons and form positive ions. It increases down a group and decreases across a period from left to right. The given elements belong to the following groups and periods: K: Group 1, Period 4 Mg: Group 2, Period 3 Al: Group 13, Period 3 B: Group 13, Period 2 N: Group 15, Period 2 Potassium (K) is an alkali metal and is the most metallic among the given elements. Magnesium (Mg) is an alkaline earth metal and is more metallic than aluminium (Al), which is a p