Question

question 1 (2 points)
which element has the smallest radius?
be
ba
f
mg
s

Explanation:

Atomic radius trends: decreases across a period (left - to - right) and increases down a group. Be (Beryllium) and Mg (Magnesium) are in Group 2 (alkaline earth metals), with Mg below Be (larger radius). Ba (Barium) is also an alkaline earth metal, further down the group (larger than Mg and Be). S (Sulfur) and F (Fluorine) are non - metals. In Period 3, S is to the left of Cl, and in Period 2, F is to the right of N. Comparing F (Period 2, Group 17) and S (Period 3, Group 16), since F is in a higher period (smaller principal quantum number for valence electrons) and further to the right in its period.

Answer:

F.