Atoms & The Periodic Table

5. The process of removing electrons from an atom to form ions
7. Electrons in the outermost shell
8. Protons and neutrons are composed of even smaller particles called _____
11. Type of bonding where atoms share many free electrons
14. There are how many known quarks?
18. These are good conductors of heat and electricity. They also have luster and a high density
20. Atom with the same number of protons and electrons but different numbers of neutrons
21. #6 on The Periodic Table of Elements
23. To find the number of ____: Subtract the atomic number from the atomic mass
25. This is a positively charged particle
26. These have properties of both metals and nonmetals
29. Type of bonding where atoms share electrons
30. Used a gold foil experiment to help understand the structured of an atom
31. Metals are considered this if they can be made into sheets

1. Group of nitrogenous organic compounds that are essential parts of living cells.
2. The attraction that holds atoms close to each other
3. - Metals are considered this if they can be made into wire.
4. Atoms always have the same number of protons and electrons; this is called the _____ number
6. The positively charged dense center of an atom
9. This is the smallest part of an element which can take part in a chemical reaction
10. The nucleus has almost all of the ____ of the atom
12. Atoms are arranged on The Periodic Table of _____
13. Type of bonding where an atom gains or loses electrons (+/-)
15. These types of metals are found in the middle of The Periodic Table
16. A ____ is a vertical column on The Periodic Table of Elements
17. Abbreviation for Atomic Mass Units. The number of protons, neutron, and electrons
19. A ______ is a horizontal row on The Periodic Table of Elements
22. These are brittle, poor conductors, have no luster
24. This particle has no charge
27. This scientist created the atomic theory
28. Organic compound consisting entirely of hydrogen and carbon