Which selection contains elements that are all in the same period? rb, sr, la, zr al, ga, si, p n, o, cl, br hg, tl, pb, bi

Hg, Tl, Pb, Bi.

Explanation:

The elements that are all in the same period are: Hg, Tl, Pb, Bi.

Kindly, find the attached image that show that all elements are in period 6.

Rb, Sr, La, Zr :

All are in period 5 except La is in period 6.

Al, Ga, Si, P :

All are in period 3 except Ga is in period 4.

N, O, Cl, Br:

N, and O are in period 2. While Cl is in period 3 and Br is in period 4.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )

you need to have a picture of the atom that way we can answer it