Question

1. which of the following atoms has the largest radius? a. na b. c c. ba d. he e. h

Explanation:

Atomic radius generally increases down a group and decreases across a period. Ba is in period 6, group 2; Na in period 3, group 1; C in period 2, group 14; He and H in period 1. Ba has more electron shells, so its radius is largest.

Answer:

C. Ba