Question

Elements on the periodic table decrease in atomic size when you move across a period from left to right, and when you move down a group. T or F

Answer 1

Atomic size? As in atomic mass?

Answer 2

Do you know what elements on the period table are listed according to?

Answer 3

*periodic, sorry

Answer 4

I think we're talking about atomic radius here. As you move left to right across a period, atomic radius decreases, as the effective nuclear charge (sort of like the number of protons) increases and so electrons are attracted more closely to the nucleus.

As you move down a group, you're adding additional energy levels. This means the electrons will physically be further away from the nucleus because the "shell" of the energy level will encompass all the lower energy levels as well. In other words, atomic radius INCREASES.

Therefore the answer is false (only the first part is correct).

Answer 5

well i have to say false

Answer 6

the first statement is true but the second statement is false because as you add more electrons and protons the electrons move further and further away from the nucleus and the protons have less affect on the electrons allowing for a larger atomic radius

Answer 7

well i just realized i rewrote exactly what everyone else said..