Question

Science
Science Cycle 1 Learning
Oh 40m 3s
Left
What is the charge /valency on positive and negative ion in CaCO3?
a) +2 -1
b) +2 -2
c) +1 -2
d) +1 -1
Q9. OPTIONS:
A
B
co do
o​

Answer 1

Answer:

I don't understand that