Atoms: Nature's Legos

2. The area in space where an electron is likely to be
4. When very small particles in objects emit energy or smaller particles. It can come from unstable atoms that undergo radioactive decay, or it can be produced by machines
6. An elementary particle found in the nucleus of an atom that has a positive charge of electricity
10. The smallest unit into which matter can be divided without the release of electrically charged particles
11. An atom or group of atoms that carries a positive or negative electric charge
12. A material that conducts current, but only partly
13. A simple substance that cannot be broken down into smaller parts or changed into another substance

1. An elementary particle found in the nucleus of an atom that is uncharged
3. The creator of the first Periodic Table
5. A variation of an element that possesses the same atomic number but a different mass number
7. A small particle with a negative charge that is found in all atoms outside the nucleus
8. The amount of matter or substance that makes up an object
9. A table of the chemical elements arranged in order of atomic number
14. Any substance that has mass and takes up space by having volume
15. The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass