1. All substances are made from atoms.
There are about 100 different types of atoms
An element is a substance which contains only one type of atom
Atoms

2. The Periodic Table
The Periodic Table

3. Element, Compound, Mixture

4. Atoms have a small central nucleus containing protons and neutrons
Structure of an Atom
Atoms have a small central nucleus containing protons and neutrons
Electrons orbit the nucleus
Protons, neutrons and electrons have different masses and charges
Structure of an Atoms

5. Atomic structure
Atomic Structure

6. Atomic structure
Atomic Structure

7. The atomic number is the number of protons in the nucleus
In an atom, the number of electrons always equals the number of protons
Atoms do not have an overall electrical charge
Atomic Number

8. Atomic number
Atomic Number

9. The mass number is the total number of protons and neutrons in an atom
The number of neutrons can be calculated by subtracting the atomic number from the mass number
Mass Number

10. Mass number
Mass Number

11. Calculations
Calculations

12. Isotopes have the same atomic number but different mass numbers
Isotopes are atoms of the same element that have different numbers of neutrons (e.g. carbon-12 and carbon-14)
Isotopes have the same atomic number but different mass numbers
Isotopes

13. Isotopes
Isotopes

14. Each electron in an atom is at a particular energy level (or shell)
Electrons
Each electron in an atom is at a particular energy level (or shell)
Electrons fill the lowest energy levels first (nearest to the nucleus)
The first shell can take a maximum of 2 electrons, the second shell can take 8, and the third shell can take 8
Electrons

15. Electron Shells
Electron shells

16. Electron arrangements

17. Wordsearch
Wordsearch

18. Quiz
Quiz