Atom and Periodic Table

1. Atoms always have the same number of protons and electrons and thus it is considered to be electrically __________.
3. These are brittle and are poor conductors of both heat and electricity.
9. When an atom lose(s) electron(s).
10. Used a gold foil experiment to help understand the structure of the atom.
11. when an atom gain(s) electron(s).
12. Atoms are arranged in increasing __________ on The Periodic Table of the Elements.
13. The scientist who created the atomic theory.
16. These have properties of both metals and non-metals.
17. The positively charged dense center of an atom.

2. This is the smallest part of an element which can take part in a chemical reaction.
4. Term given to the 3 particles present in an atom - protons, neutrons and electrons.
5. A __________ is a horizontal row on The Periodic Table of the Elements.
6. A __________ is a vertical column on The Periodic Table of the Elements.
7. Also known as outermost shell.
8. Metals are considered this if they can be made into sheets.
9. This element has a proton number/atomic number of 6 on The Periodic Table of Elements.
13. Metals are considered this if they can be made into wires.
14. To find the number of __________, subtract the atomic number from the atomic mass.
15. These are good conductors of heat and electricity. They are lustrous and generally have a high density.