Halogens Group 7A; very reactive non-metals; gain 1 valence electron to become negatively charged

Group 2A; slightly less reactive metals; lose their 2 valence electrons to become positively charged

Group 8A; non-reactive non-metals; do not lose or gain valence electrons, because they already have 2 or 8 valence electrons

Group 1A; very reactive metals; lose their 1 valence electron to become positively charged

Idk the answer sorry

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

The answer is b because c don't explain why the moths are on them and it isn't a because as we know only one species of moth does this

Ithe undersigned only for use your own email and delete any and copies and of the itself and to be there is a good timewhat does a decrease in temperature indicate about the molecules in a sample of liquid water? decreased chemical energy of the moleculesdecreased kinetic energy of the moleculesincreased chemical energy of the moleculesincreased kinetic energy of the moleculeshow does a sample of helium at 15 â°c compare to a sample of helium at 215 k? the helium at 15 â°c has a higher average kinetic energy than the sample at 215 k.the helium at 15 â°c has lower nuclear energy than the sample at 215 k.the helium at 15 â°c has slower-moving atoms than the sample at 215 k.the helium at 15 â°c has smaller atoms than the sample at 215 k.