It is maybe true or maybe false
Thomas Jefferson was the 3rd president
Answer:
Cobalt has 27 protons while Nickel has 28.
Explanation:
atomic mass does have to do with protons and neutrons, but its not what places the elements
The Greeks/Romans invented the concept of democracy!
1. a
2. a or b most likely a.
good luck hope this helps sorry that im not positive about the 2nd one