1. Wake-up

2. Parts of the Atom … from Discovery to Reality

3. Atom Smallest particle of an element

4. Two regions of the Atom 1. Nucleus: Small region located near the center of an atom

5. Two regions of the Atom Nucleus is made up of Protons (p + ) and Neutrons (n 0 )

6. Two regions of the Atom 2. Electrons (e - ): Surround the nucleus

7. Element The simplest substance that cannot be broken down by chemical means; consists of atoms which have the same number of protons

8. Chemical/Atomic symbol An abbreviation of a chemical element

9. Atomic Number The number of protons in a element

10. Atomic Number Location: Number above the chemical symbol

11. Mass Number The total number of protons and neutrons in the nucleus of an atom

12. Mass Number Location: Under the Atomic symbol

13. Notations What is the atomic mass of gold?

14. Notation Types Hyphen Notation Nuclear Symbol Au-197

15. How to find the number of electrons? The number of electrons is equal to the number of protons assuming neutral; look at atomic number

16. Example: How many electrons in the following element? 47

17. How to find the number of neutrons? The atomic number provides the number of protons The mass number provides the number of protons and neutrons Rounded Atomic Mass – Atomic number

18. 47