Do Now: Look at your Notebook. If pages are not hole-punched and placed in the binder, do that; Portfolios are collected today.

Homework: Finish 2 assigned atom models, due Friday.

AIMS: TLW continue to apply knowledge of phase changes, kinetic energy, and the structure of the atom.

1. Silently complete Do Now (compile portfolio). Turn in portfolio today, returned on Friday. Copy homework.

2. Review Lesson Steps.3. Please draw a diagram and describe the process

of carbon dioxide solid (dry ice) subliming to form gaseous carbon dioxide- inside a sealed container. Classwork due today.

4. Discuss Homework due today: Pg. 122 #47-51

5. Atomic models- notes6. Homework assigned:

1. Males: Li, F2. Females: Ne, B

47. The atomic number is the number of protons in the atom.

48. How many protons are in the nucleus:◦ phosphorus: 15◦ molybdenum 42◦ aluminum 13◦ cadmium 48◦ chromium 24◦ lead 82

49. What is the diff. betw. the mass # and atomic # in an atom?

The atomic number is the number of protons. The mass number is the average sum of the protons and neutrons.

For example, Hydrogen has an atomic number of one because it has one proton. Hydrogen only SOMETIMES has a neutron... The average mass of a hydrogen atom is 1.0079 amu.

atomic number = 2atomic mass = 4Element: HeliumSymbol: He

Atomic number

Mass number

Number of protons

Number of neutrons

Symbol of element

9 19 9 10 F

14 29 14 15 Si

22 47 22 25 Ti

25 55 25 30 Mn

51. Two isotopes differ from each other in the number of neutrons and also in the atomic mass. They have the same number of protons.

example: H, Hydrogen, and Deuterium, Which is an atom of Hydrogen with an atomic mass of 2 amu.

Hydrogen: 1 proton, 1 electron, NO neutrons

Deuterium : 1 proton, 1 electron, 1 neutron

Place RED DOTS on the model to represent PROTONS.

Place BLACK DOTS on the model to represent NEUTRONS.

Place GREEN DOTS on the model to represent ELECTRONS.

1.Homework assigned:1. females: Li, F-12. males: Ne, B+2