Question

Can someone help?

Answer 1

Group one: Li, Na, K, Rb, Cs
Group two: Be, Mg, Ca, Sr, Ba
Group seven: F, Cl, Br, I, At

Answer 2

K and Rb are both group one
Ba and Ca are both group two
Na and K are both group one
Cl and Na form the well-known Sodium Chloride (table salt)

hope that helps you :D

Answer 3

No it's Cl and Na as I have said :)

Answer 4

sorry I was not viewing here

Answer 5

yes i suppose so

Answer 6

would it be the last one?

Answer 7

the three oxygen atoms of \(Fe_2O_3\) contain a charge of -6 altogether, so the iron ions must have a charge of +6, leading each atom to have a charge of +3.

yep it's the last one.

Answer 8

is it the second one?

Answer 9

sorry for not replying

Answer 10

Yes

Answer 11

is it the third one?

Answer 12

or the last one?

Answer 13

I guess it'd be the third one