Atomic Structure

2. Carbon is an example.
4. Besides a family, the other name for a vertical column in the periodic table.
5. The name for a vertical column in the periodic table.
6. This neutrally charged particle is found inside the nucleus.
7. The smallest unit of matter; first named by the ancient Greek Democritus.
10. one of many forms of an element that varies only by the number of neutrons it has; Boron-5 and Boron-6 are examples.
12. This is the amount of particles found inside the nucleus; it is equal to the number of protons and neutrons together.
13. calcium is an example
14. This negatively charged particle is found outside the nucleus.
16. An abbreviation composed of one, two, or sometimes three letters that represent an element of the periodic table.
17. This positively charged particle is found inside the nucleus.

1. the average mass of ALL the isotopes of an element.
3. The whole number found in the square of the periodic table; can help you determine the amount of protons that are found in the nucleus of the atom.
6. This is the area in the center of the atom.
8. performed a "cathode ray tube experiment" where he discovered the existence of electrons.
9. Boron is an example.
11. Performed a "Gold Foil Experiment" where he discovered the existence of a positively charged nucleus.
15. Theorized that electrons travel around the nucleus in orbits like planets travel around the sun.