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. 

Answer 1

answer is

Cs > Ba > Pb > Si > P > O

explanation: as we go down the group the atomic size is increased, atomic size is decreased as we go along the group

Cs, Ba and Pb Belong to 6th period, as we go along the group atomic size decreases therefore Cs Atomic size is greater than Ba, Ba atomic size is greater than Pb, Si and P is belong to 3rd group therefore Si atomic size is greater than P, least is O, since it belong 2nd group

Answer 2

In periodic table atomic size increases from top to bottom in a group and decreases from left to right across the period Since oxygen is top most period element it has lowest size among the given elements Since silicon and phosphorous belong to same period and silicon is the left to the phosphorous silicon has larger size than phosphorous Since cesium, barium, and lead belong to same period and cesium is the left most, cesium has largest atomic size 15 Cs Ba Pb Therefore, the order decreasing atomic size is as follows Cesium (Cs)> Barium (Ba)> lead (Pb) > Silicon (Si)> Phosphorous (P)> oxygen (O)