Draw a Bohr Model of Beryllium Draw a Bohr Model of Chlorine Activity Warm Up…. Calculate the number of protons, neutrons & electrons for the following elements: Na (Sodium, element 11) & Cu (Copper, element) Draw a Bohr Model of Beryllium Draw a Bohr Model of Chlorine P 21 Date Session # Activity Page # 9/20, 25 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 9/26 Warm up 21 Subatomic Particle Numbers can change Notes 22 Edible Atoms Lab 23 Homework: none

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 explain how an atom’s subatomic particle configuration changes to become stable by taking notes and modeling the changes in the Edible Atoms lab.

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

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

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 Quick Quiz!!!

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- ***once a ring is full, it will not give up any electrons in the full ring

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

Matter MATTER IS NEUTRAL AS LONG AS AN ATOM HAS THE SAME NUMBER OF PROTONS (+) AND ELECTRONS (-) SO THE ATOM HAS A BALANCED CHARGE! BUT……sometimes atoms change!

P . Matter is neutral as long as an atom has the same number of protons (+) and electrons (-)…BUT it isn’t stable unless it has a full valence ring. The OCTET rule: elements will gain or lose electrons in order to have a full valence shell of eight electrons.

To become STABLE, most atoms.. Give or Take Valence Electrons = IONS Ions are atoms that have a charge. Li+1 F-1

Negative Ions (F-1) Anion Gain/Take an electron = negative ion (negative charge) # protons < # electrons A negative ion is written like this: Br-1 The charge is written like an exponent in math.

Positive Ion (Li+1) Cation Lose/Give an electron = positive ion (positive charge) # protons > # electrons A positive ion is written like this: K+1 The charge is written like an exponent in math.

Practice it like Math +3 + -2 = ________ 3 protons (+) and 2 electrons (-) create an ion with a charge of _____ +9 + -10 = ________ 9 protons (+) and 10 electrons (-) create an ion with a charge of ___

Cation, anion or neutral? Symbol of Element Atomic # Atomic Mass Protons Electrons Neutrons Charge Cation, anion or neutral? Lithium Atom   Ion

Cation, anion or neutral? Symbol of Element Atomic # Atomic Mass Protons Electrons Neutrons Charge Cation, anion or neutral? Beryllium Atom   Ion

Cation, anion or neutral? Symbol of Element Atomic # Atomic Mass Protons Electrons Neutrons Charge Cation, anion or neutral? Fluorine Atom   Ion

Ions on Your Own Complete this section on your own. Turn it in when you are finished. Add to your venn diagram on P13 when you are finished.

Compare and contrast protons, neutrons and electrons. Neutrons electrons