Chemistry Matters!

3. There are 118 elements on the ______________ table.
7. In order to find out how many ____________ an atom has, you must first round the atomic mass to the nearest whole number and then subtract the atomic number from that.
8. An ___________ has a negative charge and floats around the outside of an atom's nucleus.
11. If an atom has 0 neutrons, it is an atom of __________________.
12. On a square from the periodic table, the letter is called the ___________.
13. If an atom has 17 electrons, it is an atom of _________________.
14. Protons and neutrons have the same relative _______ and compose the mass of an atom. Electrons are incredibly small.
16. The nucleus is incredibly small and dense, in fact, an atom is made of mostly empty _____________.
18. All ____________ in the universe is made of the 118 elements.
19. The atomic number tells you how many ________ and electrons an atom of that element has.
20. Electrons are located in the electron ____________.

1. An ________________ is a pure substance that cannot be broken down into simpler substances.
2. A ____________ is two or more atoms bonded together. An example is H20 (water).
4. Protons and neutrons are located in the ___________ of an atom.
5. Chemistry is the branch of science that studies the ___________________ of matter and how matter changes.
6. A neutron has a ______________ charge.
9. If an atom has 6 protons, it is an atom of _____________.
10. A proton has a _____________ charge.
15. The smallest unit of an element is called an ________.
17. The whole number on a square from the periodic table is called the __________ number.
18. Matter is anything that has ______ and takes up space.