## iheartfood 3 years ago #1: Which element has the same number of valence electrons as hydrogen (H)? A. helium (He) B. oxygen (O) C. nitrogen (N) D. lithium (Li) ***my answer: D. lithium (Li) is that right?

1. jim_thompson5910

Li is in group 1, so that sounds right

2. iheartfood

#2: What happens to the atomic size of the elements as one goes from the bottom to the top of a group? A. Atomic size stays the same as one moves from bottom to top in a group. B. Atomic size decreases as one moves from bottom to top in a group. C. Atomic size increases as one moves from bottom to top in a group. D. Atomic size changes randomly as one moves from bottom to top in a group. **my answer: C. is that right??

3. iheartfood

and okay yay :) for #1!!

4. iheartfood

5. jim_thompson5910

bottom = heavier elements top = lighter elements (think of it as like the heavy stuff floats to the bottom of the pool while the light/lighter stuff floats to the top) so as you go from bottom ---> top, the size decreases

6. iheartfood

so my answer is right for #2?? it is C?

7. iheartfood

and #3: Which of the following places the elements in the correct order of increasing first ionization energy? A. Be, Mg, Ca B. Cl, S, P C. P, S, Cl D. F, O, N ***I don't get this one :( please explain! :)

8. jim_thompson5910

no, bottom ---> top means big ----> small

9. iheartfood

10. jim_thompson5910

it's not C because it's not increasing

11. iheartfood

so my answer to #2 is this? B. Atomic size decreases as one moves from bottom to top in a group. ??

12. jim_thompson5910

yeah

13. iheartfood

okay and what about #3? lemme repost it so its easier :P

14. iheartfood

#3: Which of the following places the elements in the correct order of increasing first ionization energy? A. Be, Mg, Ca B. Cl, S, P C. P, S, Cl D. F, O, N ***I don't get this one :( please explain! :)

15. iheartfood

do u get #3?

16. jim_thompson5910

have a look at this site http://www.shodor.org/chemviz/ionization/students/background.html

17. iheartfood

idk still... i use the equation?

18. jim_thompson5910

no look at the chart

19. jim_thompson5910

of ionization energies

20. iheartfood

oaky so bottom to top, left to right?

21. jim_thompson5910

yeah it looks it

22. iheartfood

okay, so my answer is C. P, S, Cl ??

23. iheartfood

it goes left to right in the periodic table.. :/ is that the answer?

24. jim_thompson5910

looks perfect

25. iheartfood

yay! :) thanks!

26. iheartfood

yay! :) thanks!