Atoms, Ions, and Isotopes

3. A subatomic particle that has a positive charge.
4. The average number of protons and neutrons based on the natural abundance of isotopes.
9. Name of the experiment that led to the discovery of the electron.
10. A pure substance that is one type of element.
11. Last Name of the person who discovered the negatively charged electron.
14. Two or more atoms that are chemically bonded together.
15. A positively charged ion that is containing less electrons than protons.
16. Atoms that have the same number of protons, but different number of neutrons.
17. Last name of the person who discovered the positively charged nucleus

1. A subatomic particle that has a negative charge
2. The number of protons in the nucleus of an atom.
4. A negatively charged ion that is containing more electrons than protons.
5. The smallest basic unit of matter.
6. The sum of the protons and neutrons in an atom.
7. Name of the experiment that led to the discovery that an atom is mostly empty space.
8. A pure substance that is made of two or more different kinds of atoms.
12. An atom that becomes charged by gaining or losing electrons.
13. A subatomic particle that has no charge.