What is the charge on the strontium ion? and what is the net charge of the ionic compound calcium fluoride??

Question

Thanx Guys for all your help..CHemisty is killing me

Answer 1

It is the easiet subject on the earth. Look at the periodic table from top to bottom each element in the colum has one charge.

Ca(Calium from column two has charge of 2+)+ Cholrine (column 7 has a charge of 8-7=1). Remeber all metals have a positive charge and all non metals have a negative charge. Now write Ca2+ + Cl 1- transfer 1- to calcium and 2+ to chlorine and you get Ca1 + Cl 2 =CaCl2

Answer 2

Honey, in learning Chemistry, you need the Periodic Table with you.

Now based on the Periodic Table (http://www.chemicool.com/), in the green column (Group II), you could find Sr which is the strontium. Since it is in Group 2, so the charge is 2+.

For a compound, you need to detemine the charge of each ions first. For calcium, it is in Group 2, so the charge is 2+.

Fluorine is in Group 7, but the charge is not 7+. It is in different case because fluorine is a non-metallic ion - it is a halogen (refer to the periodic table).

So in order to predict the charge of halogens, simply take 8 and minus with the Group number. For fluorine which is in Group 7, therefore 8 - 7 = 1. Since fluorine is not a metal, it would have a negative charge instead. So the charge for fluorine is -1.

Now in a compound of calcium fluoride, you should know by now that we need two fluorine ions to bind with one calcium ion - which is CaF2.

Just simply add all the ions charges then you get the compound net charges. In this case, (+2) + 2(-1) = 0.

So CaF2 compound has a neutral charge.

These are some links that may help you more in understanding the Periodic Table and the ion charge determination. Have fun!

Answer 3

generally 2+
net charge on CaF2 is 0
for Ca it is 2+
and for F it is 1-

Answer 4

Sr2+

CaF2 no net charge. Ca2+ 2F-