Question

1. fill in the blanks below, and then draw arrows on to the periodic table indicating the direction of the atomic radius trend.

generally, atomic radius
across periods and
down groups.

1. list the elements below in order of decreasing atomic radius. (biggest to smallest).

li, be, f, k, c mg, be, sr, b, ne mn, as, kr, ra, v
tc, mo, ag, rb, xe cs, fr, h, he, na y, fe, sc, ga, se

1. are the elements below in order of increasing atomic radius? if yes, write \yes\. if not, write them in the correct order.

b, al, ga, in ti, k, ca, v o, s, se, te
na, fr, cs, f hg, ti, pb, bi rn, bi, w, ba

1. briefly explain why atomic radius changes down groups.
2. briefly explain why atomic radius changes across periods.

Explanation:

Step1: Analyze atomic radius trend across periods

As we move across a period (from left to right), the number of protons in the nucleus increases. This leads to a greater positive charge in the nucleus, which pulls the electrons closer. So, atomic radius decreases across periods.

Step2: Analyze atomic radius trend down groups

When moving down a group, new electron shells are added. Each new shell is further from the nucleus. Although the nuclear charge also increases, the effect of the additional electron shells dominates. So, atomic radius increases down groups.

Answer:

Generally, atomic radius decreases across periods and increases down groups.