Date Session # ActivityPage # 9/3-4 2More Atomic Structure3 Periodic Table Practice4 9/5,8 3When Atoms “Change”5 Bohr Model & Lewis Dot Directions6 Practice Models7 Homework: Complete Bohr/Lewis w/s …lunch Warm Up….complete on page 5 of your notebook 1.Calculate the number of protons, neutrons & electrons for the following elements: Na (Sodium-11) & Cu (Copper-29) 2.What would be the effect of adding two neutrons to element number 47? 3.What would be the effect of removing a proton from element number 27? 4.What might be the affect of removing two electrons from element number 12?

Warm Up….complete on page 5 of your notebook 1.Calculate the number of protons, neutrons & electrons for the following elements: Na (Sodium) & Cu (Copper) 2.What would be the effect of adding two neutrons to element number 47? Increased atomic mass What would be the effect of removing a proton from element number 27? Becomes a different element Fe (Iron) 1.What might be the affect of removing two electrons from element number 12? Not neutral anymore

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 what happens when an atom’s subatomic particles change by taking notes and completing a practice sheet, then they will illustrate atomic structure by completing Bohr models and Lewis Dot structures.

What element does this represent? Explain to your neighbor how you identified it.

Think of it differently…. What element does this represent? ___ ____ ____ ___ ___ _____

Think of it differently…. What element does this represent? ___ ___ __ __ __ __ __ ___

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!

An atom can become stable by changing the # of Electrons = Ions Ions are atoms that have a charge Ions are atoms that have a charge Ions form when an atom - Ions form when an atom - – Gain an electron = negative charge (anion Cl - ) – Lose an electron = positive charge (cation Ca + )

Changing the # of Neutrons = Isotopes Isotopes are atoms of the same element that have a different number of neutrons. Isotopes are atoms of the same element that have a different number of neutrons. Adding or losing a neutron is like gaining or losing weight…same identity, different mass! Adding or losing a neutron is like gaining or losing weight…same identity, different mass!

Changing the # of Protons = Different Element Changing the number of protons results in a different element. Changing the number of protons results in a different element. The number of protons determines what element it is! (ID number!) The number of protons determines what element it is! (ID number!) Atoms that change proton number are radioactive. Atoms that change proton number are radioactive.

How are subatomic particles arranged? p6 Bohr Model of the atom: All of the protons and the neutrons The 1 st ring can hold up to 2 e - The 2 nd ring can hold up to 8 e - The 3 rd ring can hold up to 8 e - 10P 11N The outermost ring/level of electrons are the valence electrons

Valence electrons determine the bonding/combining POWER of an atom. They also determine it’s chemical properties. Word origin/stem late Middle English: from late Latin valentia ‘power, competence,’ from valere ‘be well or strong.’ 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.

Draw Bohr models (atomic models) for As a class: “ get ye to a white board” B (Boron element 5) Na (Sodium, element 11) On your own: O (Oxygen, element 8) Li (Lithium, element 3) Draw on page 7

Lewis Dot Structures The behavior of an atom is determined by the VALENCE ELECTRONS…so wouldn’t it be easier to just draw those?? (the others 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

Start the Atomic Model w/s 35% grade Bohr Model Side….complete first two rows, the rest is homework. Lewis Dot Side…complete the first two rows, the rest is homework.

Summarize with your neighbor everything we have learned thus far about matter. Be prepared to share.

Quiz… When you are done, turn it over and place it on the corner of your desk Continue working on your homework. If you finish…look for patterns in the rows and columns you have completed..