How many protons, neutrons, and electrons make up an ion of
radium-208 that has a +2 charge?

An observation that requires measurement is called quantitative observable or qualitative

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?

The identities of substances are the same before and after which type of change