Actually, I believe it is protons. Remember that isotopes are composed of the same element with different numbers of neutrons, and ions are the same element with different numbers of electrons. It is protons that matter.
Check the periodic table on that one.
Whoa there. Smallest particle. Remember that molecules are made of atoms, and so on. Go back and check that one.
Are you sure? Remember that you answered above that neutrons have no charge. How can they balance out a charge if they have none themselves?
Remember what I said about question 2.
Take a look at your periodic table, and remember question 2. What element has two less protons than oxygen?
Heh. Sorry, you might want to look that up.
Is E a reason that they're empty space, or just a fact about the atoms?
Check your periodic table.
Nuclear reactor fuel is mostly plutonium and uranium, not transition metals in general.
Sure?
Remember what water is: hydrogen and oxygen.
Remember question two, and use a periodic table.
Remember question 2.
Remember that atomic number = number of protons.
There are only around 100 different elements...
Note that I'm not giving you the answers, only help. I also didn't answer all of the questions, as some were correct and some I just don't know.
Just remember these basic facts:
The periodic table is organized by atomic number, which is the number of protons in the nucleus of an atom.
Adding protons gives you a new atom.
Adding neutrons or electrons just gives you a new isotope or ion of that same element, respectively.
Atomic mass is also listed on the periodic table for your enjoyment.
Good luck.