4, loses an electron. a plus sign indicates an atom is losing an electron while a minus sign indicates an atom is gaining an electron
hope this helps!
Grasshopper population will increase since they have less predators
About 1 gram. 1 part of 50 is 2%
There doesn't seem to be a clear answer, it is placed in the center when it's substances is on the corners it doesn't give anything else
Barium fluoride (BaF2) - Also known as Barium(II) fluoride - because it's a combination of two different kinds of ions (binary = two).
