Question

Place the following elements in order of decreasing atomic size: lead, phosphorus, oxygen, cesium, barium, and silicon.

Rank from largest to smallest. To rank items as equivalent, overlap them.
Cs, O, P, Si, Ba, Pb

Answer 1

Cs> Ba> Pb>Si> P>O

Step-by-step explanation:

Recall that atomic size decreases across a period and increases down the group.

As we move from Cs to Ba, the atomic size decreases across the period. Lead is larger than silicon since atomic size increases down the group.

Between phosphorus and oxygen, phosphorus is larger than oxygen as you move across the period.