Sr3(PO4)2 is definitely Ionic
D, since it can hold up to 10 electrons
It’s either the first or second one
I think it’s the first one - the outer cells of the blastocyst
D) burning magnesium ribbon, as combustion is a chemical reaction so causes chemical change. The other 3 options do not involve reactions so there isn't a chemical change.
The answer is D they have 4 neutrons
