Unit 6, Lesson 2: Structure of the Atom

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Presentation transcript:

Unit 6, Lesson 2: Structure of the Atom

Structure of the Atom This should be review from last year! Please read and complete the Atomic Structure worksheet. Go over first row, then allow students to work. - 15 min

Element or Ion Atomic Number Mass Number # of Protons # of Neutrons # of Electrons Li 3 7 4 Ba2+ 56 137 81 54 Al3+ 13 27 14 10 F- 9 19 Br 35 80 45 Ru3+ 44 101 57 41 Cr2+ 24 52 28 22 S2- 16 32 18 Si C 6 12 P3- 15 31

Brain Break!

Isotopes The number of protons in an atom is definitive of that atom, but the number of neutrons can vary. Isotopes are atomic species having the same atomic number but different atomic masses.

Natural Mixtures of Isotopes The mass numbers on the periodic table represent the average values for the mixtures of isotopes that occur in nature. Example: Experiments show that naturally occurring chlorine is a mixture which is 75.77% Cl-35 and 24.23% Cl-37. What is the expected molar mass of chlorine? Assume 1 mol total, calculate mass of each, then add them together. – 15 min

Homework: Pg. 150 #23 5 min