The halogens and noble gases are alike because they are all non-metallic elements, with the exception of astatine, a radioactive
Answer:
they just add heat, then it turns to water vapor
Explanation:
The first h20 is water the arrow represents adding heat, and the second h20 represent water vapor (water as a gas)
Answer:
D.
Explanation:
I had looked it up on the quiz site
Answer:
Manganese (Mn)
Explanation:
We know it's manganese because we are told it is an electrically neutral atom. This means it has the same number of protons and electrons. If it has 25 electrons, it has 25 protons. Protons tell us the atomic number of the atom, which also tells us the name of the element. Manganese is element 25 on the periodic table.
Answer:
13
Explanation:
proton plus neutron equal to atomic mass
