Warm Up….complete the Venn diagram on p 13 of your notebook Activity Date Session # Activity Page # 9/20, 25 8 Subatomic Particle Calculations 17 Subatomic Information on the Periodic Table -Notes 18 Bohr Model & Lewis Dot Diagram Rules 19 Bohr Model & Lewis Dot Diagram Practice 20 Homework: Study for Quiz: States of matter, Atomic structure, Periodic table cells

Compare and contrast protons, neutrons and electrons. Neutrons electrons

8.P.1 Understand the properties of matter and changes that occur when matter interacts in an open and closed container. 8.P.1.1 Classify matter as elements, compounds, or mixtures based on how the atoms are packed together in arrangements.

TLW calculate atomic structure using notes, summarizing demonstrations and completing atom family periodic table cells.

Bringing it all together… For example, OXYGEN is an element on the periodic table. It is made of only one type of atom Actual Oxygen Atom Oxygen on the Periodic Table

Atomic Number = number of protons PERIODIC TABLE CELLS Atomic Number = number of protons atomic ID # In neutral atoms: number protons = number electrons this is an average

CO ≠ Co SYMBOL RULES: ELEMENTS START WITH A CAPITAL LETTER Any other letters in the symbol are lower case…Just like when you write your name Co ≠ CO !! this is an average CO ≠ Co

Atomic Mass = number of protons + number of neutrons this is an average

Are Units Important? So what units should we use when describing the mass of an proton, or neutron or electron?

How far is it from Charlotte to San Diego?

How far is it from Charlotte to San Diego? 3,835,000,000 mm OR 150,990,000 inches 2,385.3 miles

So what units should we use when describing the mass of an proton, or neutron or electron?

1 proton = 3.687502724 x 10-27 lb =.000000000000000000000000003687502724 lb 1 electron = 2.006647510 × 10−30 lb .000000000000000000000000000002006647510 lb

Atomic Mass Units…just for atoms! Protons = 1 amu Neutrons = 1 amu Electron mass insignificant …0. (their charge and configuration are VERY IMPORTANT, not their mass)

In your notebook, on the paper under the note sheet on page 18 To find the number of Neutrons: Round the Atomic Mass to a whole number Atomic Mass – Atomic Number=NEUTRONS P + N -- P = N Nucleus -- protons = neutrons

p 18 Atomic Number = Protons = Electrons Mass - Atomic Number = Neutrons I am a chemistry maniac! KING KONG CHEMISTRY Guided Practice: have the students use the EOG copy of the periodic table to find: an element given its atomic number, the number of protons in a specific element, the number of electrons in an element/atomic number, an element with X neutrons. Candy rewards??? Quick Quiz!!!

P 17 Use your notes and the periodic table at your seat, complete the following worksheet

P 17

P 17

How are subatomic particles arranged? Bohr Model of the atom: All of the protons and the neutrons The 3rd ring can hold up to 8 e- 10P 11N The 1st ring can hold up to 2 e- The 2nd ring can hold up to 8 e-

Valence electrons determine: how an atom bonds with other atoms (or if it will bond at all). atom’s reactivity (how easily it bonds with other elements.) Atoms with a complete set of valence electrons are stable. They don’t bond with other atoms: don’t gain/lose electrons, don’t share electrons. Word origin/stem late Middle English: from late Latin valentia ‘power, competence,’ from valere ‘be well or strong.’ P 19

Draw Bohr models (atomic models) for P 20 As a class: B (Boron, element 5) Na (Sodium, element 11) On your own: O (Oxygen, element 8) Li (Lithium, element 3)

(because the others are in full rings and aren’t going anywhere) Lewis Dot Structures The behavior of an atom is determined by the VALENCE ELECTRONS…so wouldn’t it be easier to just draw those?? (because the others are in full rings and aren’t going anywhere)   Write the symbol for the element Calculate the number of valence electrons (Use dots to represent the electrons.) Place electron “dots” around the symbol, starting on the left and moving clockwise. Begin by placing only one electron dot per side of the element symbol. More than 4 valence electrons? Add the second dot to each side (clockwise) Max of two electron dots per side