Which statement describes atomic radii as one moves from top to bottom within a group?
a. the atomic radius increases from top to bottom within a group.
b. the atomic radius decreases from top to bottom within a group.
c. the atomic radius does not vary in any predictable way within a group.
d. the atomic radius is the same within a group.

a.The atomic radii increases from top to bottom within a group.

Explanation:

We know that

When we move from top to bottom in  a group then the atomic radii increases When we move from top to bottom in a group then number of shell increases.

Therefore, the distance of electron in outermost shell from the nucleus is also increase.Hence, the atomic radii  increases.

But when we move from left to right in a group then nuclear pull increases because number of electron increases in the same shell.

Therefore, size of atom decreases and atomic radii decreases.

Hence, the atomic radii increases as one moves from top to bottom within a group.

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.