Answer:
The columns of the table represent groups, or families, of elements. The elements in a group often look and behave similarly, because they have the same number of electrons in their outermost shell
12. V.
13. W.
14. A.
15. R.
16. N.
17. X/Y
18.X/Y
19. M.
20. O.
21. W.
22. I.
23. U.
24. T.
25. P.
————
I believe that is all right
Sorry if not, Gl!
By the way, the ones that are “X/Y”
are the same answer so just put either X or Y.
Answer: 0.84 g
Explanation:

Given: moles of iron = 0.015
Molar mass of iron = 56 g/mol

Thus 0.84 g of iron participated in the chemical reaction.
Explanation:
Nitrogen triiodide (NI₃)
Valence electrons of nitrogen = 5
Valence electrons of iodine = 7
The total number of the valence electrons = 5 + 3(7) = 26
The Lewis structure is drawn in such a way that the octet of each atom and duet for the hydrogen in the molecule is complete. So,
The Lewis structure is shown in image below.
Nitrogen posses one lone pair and thus the geometry is pyramidal.