Vocabulary Unit 1 Chs 4-5

2. Number: The number of protons in the nucleus of an atom.
6. Electrons: The electrons in the outermost energy level of an atom, Which determine how an atom bonds with other atoms
9. Elements that have properties of both metals and nonmetals
11. Bond: The force of attraction between oppositely charged particles
12. Positively charged particles inside the nucleus of an atom
13. Bond: A bond in which valence electrons are shared between atoms.
14. Particles with no charge found inside the nucleus of an atom
15. number after a symbol that tells how many atoms of an element are in each molecule

1. Symbol: A one or two letter abbreviation for an element.
3. formula: A combination of chemical symbols and numbers used to represent a compound or indicate atoms present in a molecule.
4. horizontal row of elements on the periodic table of elements
5. Gases:The elements in the far right column of the periodic table, which have full outer energy levels and will not combine with other elements under ordinary conditions
7. Atoms of the same element have the same number of protons but different numbers of neutrons
8. amount of matter in an object.
10. Negatively charged particles surrounding the nucleus of an atom
11. A charged particle.