Rank the following elements in order of decreasing atomic radii: Br, Fr, Ca, Ba and As.
A) Fr Ba Ca As Br
B) Br As Ca Ba Fr
C) Fr As Br Ba Ca
D) Fr Ba As Br Ca
E) Ca Ba Fr Br As

Question

Rank the following elements in order of decreasing atomic radii: Br, Fr, Ca, Ba and As.
A) Fr > Ba > Ca > As > Br
B) Br > As > Ca > Ba > Fr
C) Fr > As > Br > Ba > Ca
D) Fr > Ba > As > Br > Ca
E) Ca > Ba > Fr > Br > As

Quizplus · Accepted Answer

Atomic radius generally increases as you move down a group in the periodic table and decreases as you move across a period from left to right. Francium (Fr) is the largest because it is in the bottom left corner of the periodic table. Barium (Ba) is next as it is in the same group as Ca but one period down. Calcium (Ca) is smaller than Ba and Fr but larger than As and Br, which are to the right of it in the periodic table. Arsenic (As) is larger than Bromine (Br) because it is to the left of Br in the same period.

Rank the Following Elements in Order of Decreasing Atomic Radii