1. CHEMISTRY PART 1 Atoms and The Periodic Table

2. Definitions  Chemistry:  The study of the structure and properties of matter.  Element:  A substance with only one single type of atoms.  Found on the Periodic Table (page 420).

3. Definitions  Atom:  The smallest part of an element.  Molecule:  A group of atoms bonded together.

4. Parts of an Atom  Protons:  Positive charge (+1)  In the nucleus (centre)  Neutrons:  No charge (0)  In the nucleus  Electrons:  Negative charge (-1)  In clouds (shells) that surround the nucleus

5. Parts of an Atom  Basic Atomic Structure Basic Atomic Structure

6. Atoms  Atomic Number (Z):  The number of protons.  Gives the atom its place on the Periodic Table.

7. Atoms  Atomic Mass (A):  The nucleus has the most mass.  Often rounded so: number of protons + number of neutrons number of neutrons = atomic mass – number of protons

8. Atoms  Number of Electrons:  When the atom is neutral: electrons is same as protons

9. Periodic Table  Contains elements and gives information about them.  Element’s symbol  Name of Element  Atomic Number  Atomic Mass

10. Periodic Table Example  Element’s symbol OO  Name of Element  Oxygen  Atomic Number  8 (8 protons)  Atomic Mass  15.999 (16 – 8 = 8 neutrons)  Number of electrons 88

12. Periodic Table Activity  Use your periodic table to find:  Element Name  Number of Protons  Number of Electrons  Number of Neutrons  C  Be  H  N  Ne

13. Periodic Table Activity CC  Carbon 66 66  12 – 6 = 6

14. Periodic Table Activity  Be  Beryllium 44 44  9 – 4 = 5

15. Periodic Table Activity HH  Hydrogen 11 11  1 – 1 = 0

16. Periodic Table Activity NN  Nitrogen 77 77  14 – 7 = 7

17. Periodic Table Activity  Ne  Neon  10  20 – 10 = 10

18. Practice  Worksheet.  Page 97 # 11 – 14 and 21.