Question

what element in the second period has the largest atomic radius?
lithium
potassium
neon
carbon

Explanation:

Atomic radius decreases across a period from left to right due to increasing nuclear charge. Lithium (Li) is the first element in the second period. Potassium (K) is in the fourth period. Neon (Ne) and carbon (C) are further to the right in the second period than lithium.

Answer:

lithium