Warm-up 8-24-15 and 8-25-15 Partner Talk What are inside atoms? What is inside the nucleus of an atom? What is the charge of a stable atom?

Atoms Atoms – the basic building blocks of matter that make up everyday objects.

Write your name in dots Why are we doing this? Look at it close then far away

Atomic Structure Atoms have 2 regions: Nucleus – The center of the atom that contains 99% of the atom’s mass. Electron cloud- large region that surrounds the nucleus and occupies most of the space of the atom. Nucleus Electron Cloud

The Nucleus The nucleus contains 2 of the 3 subatomic particles: Protons – subatomic particles that have a positive electric charge and a mass of 1amu Neutrons – subatomic particles with a neutral (zero) electric charge and a mass of 1amu

Electron Cloud The third subatomic particles is outside of the nucleus, it is in the electron cloud: Electron – Subatomic particle with a negative electric charge and with relatively no mass. These circle the nucleus

Brain Pop- Atoms stop at 1:36

Electrons are actually organized in the electron cloud… The electrons are placed in energy levels called orbitals or shells. Each orbital or shell can only hold a certain amount of electrons. 1st shell can hold up to 2 electrons 2nd shell can hold up to 8 electrons 3rd shell can hold up to 8 electrons

So how would we draw/model this? Fill in the orbitals from the inside out using the 2,8,8 rule. Ex: Aluminum has 13 electrons First orbital would have 2 electrons Second orbital would have 8 electrons Third orbital would have 3 electrons

Let’s practice modeling an atom Draw the atom model for Magnesium 12 protons, 12 electrons, 12 neutrons

Subatomic Particles Location Charge Mass Proton Inside Nucleus + 1 1 amu Neutron Electron Outside Nucleus - 1 0 amu

Brain Pop

Let’s review with some Silent 4 Corners…

Silent Four Corners Question #1 What is the charge of a proton? a. +1. b. -1. c. 0. d. +2.

Silent Four Corners Question #2 When José brushes his hair with a comb he receives extra electrons, the same happens when you rub a balloon against your hair. The charges that make your hair static are: a. positive b. negative c. neutral d. there’s no charge

Silent Four Corners Question #3 The center of the atom contains most of its mass and it is positively charged. The center of the atom is called: a. proton. b. neutron. c. electron. d. nucleus.

Silent Four Corners Question #4 Which subatomic particles are found inside of the nucleus? a. protons. b. neutrons. c. electrons. d. both a and b.

Silent Four Corners Question #5 What area of an atom is mostly empty space? a. the nucleus b. the proton c. the electron cloud d. the neutron

Go to http://bit.ly/pHetBaA Click on Atom pHet Build an Atom Go to http://bit.ly/pHetBaA Click on Atom When done download “ 8-30 and 8-31 atom model practice”