Question

which of the following has the largest atomic radius? na p al si mg

Explanation:

Atomic radius decreases across a period (from left to right) in the periodic table. This is because as we move from left to right, the number of protons in the nucleus increases (increasing the nuclear charge), and electrons are added to the same principal energy level. The increased nuclear charge pulls the electrons closer to the nucleus. Among the elements Na (sodium), Mg (magnesium), Al (aluminium), Si (silicon), and P (phosphorus), all are in the third period. Na is the left - most element among them.

Answer:

Na