DO NOW 1)Ice is solid. Is this a physical or chemical property of ice? 2) Draw and complete the chart shown below. States of Matter are Physical Properties.

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Presentation transcript:

DO NOW 1)Ice is solid. Is this a physical or chemical property of ice? 2) Draw and complete the chart shown below. States of Matter are Physical Properties (solid, liquid, gas) OxygenCarbonHeliumGoldSilicon Chemical Symbol Protons Electrons 8 8 O C 6 6 He 2 2 Au Si 14 14

Homework and Announcements Due: Pages Science Fair Projects (28 days and counting) Textbook pages 340,341 and

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Quick Review - Atomic Mass Atomic Mass = protons + neutrons 12 = 6 + n neutrons = Atomic mass – Atomic # n = mass – p+ n = 12-6 n = 6 6 C Average Atomic Mass Carbon Atomic number

nn e - n e-e- 1 Proton Isotopes Atoms of the same element that have a different number of neutrons. (Same number of protons) Hydrogen-3 Hydrogen-2 2 Neutrons1 Neutron Mass number = (p+) + n Mass number = (p+) + n + +

Mass Number and Isotopes Atomic mass = protons + neutrons Carbon – 12 Carbon – 14 Carbon – 12Carbon - 14Mass = (p+) + n 12 = 6 + n14 = 6 + n 12 – 6 = n14 – 6 = n n = 6n = 8 Mass is 12 Mass is 14 6 C 12.01

5 B Boron Let’s see what you know! What is the atomic mass of Boron? 2.What is the atomic number for Boron? 3.How many protons are in an atom of B? 4.How many neutrons are in an atom of B? 5. How many neutrons are in an atom of B-9? n = 11 – 5 = 6 n = 9 – 5 = 4 Brilliant !

Glue-In and Practice Worksheet: Atoms and the periodic table 2

Summary Write a paragraph (3-4 sentences) reflecting on today’s lesson. What is an isotope? How do you determine the number of neutrons for an atom? Which elements on the periodic table are the most reactive? least reactive?

Independent Work Textbook pages 340,341 and