DO NOW TUESDAY

1. DO NOW TUESDAY • Quietly sit down and begin work on your Physical and Chemical Properties and Changes quiz. • When finished, turn your quiz in at the side cart and pick up a half sheet of paper. • Write everything you know about atoms on this sheet.

2. Today’s PLAN • To differentiate between the subatomic particles of an atom: protons, neutrons, and electrons. • To explain the structure of the nucleus. • To discuss what the atomic mass number and atomic number represent concerning the atoms of an element. • Todays DO • We will complete foldables about the atom, atomic number, and atomic mass number as notes to put in our binders. • We will practice identifying the atomic number and atomic mass number. Any practice that is not completed during class will be HOMEWORK.

3. Atoms

4. Atoms • Atoms are the basic building blocks of all matter. • EVERYTHING on Earth is made of atoms…even the air and your body.

5. Atoms e- Atoms are made of three particles: e- N + + • Protons (+) • Neutrons (N) • Electrons (e-) + N N + e- Electron Proton Neutron

6. Protons • Protons • Located in the nucleus • Have a positive charge • Have a mass of one N

7. N N Neutrons Neutrons • Located in the nucleus • Have no charge • Have a mass of one –similar to the proton N

8. e- e- Electrons Electrons • have a negative charge • orbit the nucleus of the atom • are very small (have basically NO mass) • in a neutral atom, there are the same • number of protons and electrons

9. Neutron Proton Electron Atom Structure - + + -

10. What force holds all the parts of an atom together? • It is the electromagnetic force of attraction between the positive protons in the nucleus and the negative electrons orbiting around the nucleus that holds the atom together.     

11. Andy the Hydrogen Atom Lets take a look deep inside

12. Andy the Hydrogen Atom Lets take a look deep inside

13. Andy the Hydrogen Atom Lets take a look deep inside

14. Andy the Hydrogen Atom Lets take a look deep inside

18. +

19. This is a Proton. + Charge Mass of ONE Identifies the atom +

20. This is a Proton. + Charge Mass of ONE Identifies the atom + N

21. This is a Proton. + Charge Mass of ONE Identifies the atom + N

22. e- This is a Proton. + Charge Mass of ONE Identifies the atom + N This is a Neutron No Charge Mass of One

23. This is an Electron. - charge No Mass e- This is a Proton. +Charge Mass of ONE Identifies the atom + N This is a Neutron. No Charge Mass of ONE

24. Atomic Number Elements contain one or more of the same type of atom! All known elements can be found on the periodic table. • Elements can be identified by their atomic number. • The atomic number is the number of PROTONS in the • atoms of an element. • It can be used like a social security number for people. • It is used to IDENTIFY the element from the • Periodic Table. Example: An element with 6 protons has an atomic number of 6 and is the element Carbon from the Periodic Table.

25. Now You Try • Identify the element and tell how many protons it has: 1) Atomic number 7 Nitrogen: 7 protons 2) Atomic Number 20 Calcium: 20 protons • Identify the element and give its atomic number. 3) 15 protons Phosphorus: Atomic number 15 4) 4 protons Helium: Atomic Number 4 • Give the atomic number and number of protons. 5) Argon Atomic number 18; 18 protons 6) Sulfur Atomic number 16; 16 protons

26. Atomic Mass Number • The atomic mass number includes the number of protons and neutrons, since they are the two largest particles in the atom. • Since they are both located in the nucleus, the mass of the atom is located in the nucleus. • Atomic Mass Number = protons + neutrons

27. Using the Periodic Table

28. Using the Periodic Table 2

29. Using the Periodic Table 2

30. Using the Periodic Table Atomic Number- identifies the element. (also the number of protons) 2

31. Using the Periodic Table Atomic Number-identifies the element. (also the number of protons) 2 He

32. Using the Periodic Table Atomic Number-identifies the element. (also the number of protons) 2 He

33. Using the Periodic Table Atomic Number-identifies the element. (also the number of protons) 2 Element symbol- gives the name of the element. He

34. Using the Periodic Table Atomic Number-identifies the element. (also the number of protons) 2 Element symbol- gives the name of the element. He 4

35. Using the Periodic Table Atomic Number-identifies the element. (also the number of protons) 2 Element symbol- gives the name of the element. He 4

36. Using the Periodic Table Atomic Number-identifies the element. (also the number of protons) 2 Element symbol- gives the name of the element. He 4 Atomic mass number-The number of protons + neutrons.

37. Using the Periodic Table Atomic Number-identifies the element. (also the number of protons) 2 Element symbol- gives the name of the element. He 4 Atomic mass number-The number of protons + neutrons.

38. Now You Try For the following pictures, give the name of the element, its atomic number, number of protons, and atomic mass number. Beryllium Atomic number 4 4 protons Atomic mass number 9 Sodium Atomic number 11 11 protons Atomic mass number 23 Oxygen Atomic number 8 8 protons Atomic Mass Number 16

39. Water – H2O (2 atoms of hydrogen and one atom of oxygen) Compounds Compounds contain more than one type of atom! Example of organic compound (a compound with carbon and hydrogen atoms): • Methane (natural gas) – CH4 (1 atom of carbon and • four atoms of hydrogen) Example of inorganic compound (a compound without carbon and hydrogen atoms):

40. - + IONS An ion is an atom or group of atoms with a positive or negative charge!! • A particle with a neutral charge has the same number of • protons and electrons. • An ion does not have the same number of electrons and protons. • Examples of ions: • H+ - A hydrogen atom that is missing one electron. • The atom has one more proton than electron, • and must have a positive charge. • CO32- - Carbonate has two more electrons than protons