1. Notes Atoms (Part 2):  All matter is made up of atoms  The different types of atoms are called elements Atoms are made of 3 sub-atomic particles… …protons (are the blue circles) …neutrons (are the green circles) …electrons (are the orange circles) Note: Protons and neutrons are found in the center area called the nucleus Note: In atoms the number of protons and electrons are always the same (3 in this case) SPI 0807.9.1 Atoms Here is a model of one lithium atom Nucleus PRESS THE RIGHT-ARROW BUTTON ON YOUR KEYBOARD TO ADVANCE THROUGH THE PRESENTATION

2. Protons: positive charge, found in the nucleus of atoms TT he number of protons is the atomic number (3 in this case) Note: In atoms the number of protons & electrons are the same Neutrons: no charge, also found in the nucleus of atoms Electrons: negative charge, found in electron shells in the electron cloud SPI 0807.9.1 Atoms Legend =protons =neutrons =electrons Notes: Sub-Atomic Particles

3. Atomic Mass AA toms are very small particles of matter, and everything that is made of matter has mass MM ost of the mass of an atom is found in the nucleus A bout 99.9% of the mass of an atom is in the nucleus Nuclear Particles TT he two particles in the nucleus, protons and neutrons, make up 99.9 % of the mass of the atom SPI 0807.9.1 Atoms Legend =protons =neutrons =electrons Notes 99.9% 3 Li Lithium 6.9 The atomic mass for this atom is 6.9 It is displayed on the periodic table like this.

4.  Electrons are located in the electron cloud in areas called electron shells  This atom has 2 electron shells. SPI 0807.9.1 Atoms Legend =protons =neutrons =electrons Notes Electrons Nucleus 2nd Shell 1 st Shell The green area is the electron cloud area Nucleus (see cloud in green area below) These can also be called electron energy levels or electron orbitals. electron energy levels electron orbitals

5. (A) First click on the Holt Online link shown below, and log on (B) Find and click on our science textbook (go to online textbook) (C) Select "chapter 10," and click "Go" (D) Next find and click the yellow tab titled "eActivities" (E) Then beneath the gold "Visual Concepts" tab, find and click the section one link titled "Electron Cloud." (F) Write down 2 sentences describing what you learn. (Click the link below for this "Visual Concepts" presentation) Here are the steps to find this animation Link: Holt Online Textbook WebsiteHolt Online Textbook Website Online Resources SPI 0807.9.1 Atoms Now prepare to go to the Holt Online website (link is at the bottom of this slide) Electron Cloud Animation

6.  Link: Atoms-silly animationAtoms-silly animation  Link: Atoms-scale of the universeAtoms-scale of the universe Note: Zooms in down to the atomic level  Link: Hierarchy of matter-down to atomsHierarchy of matter-down to atoms Note: Also zooms in down to the atomic level Video Links SPI 0807.9.1 Atoms (A) Click on the links below to watch these 3 videos about atoms Next…view online presentations about atoms (Click the links below to see learn more about atoms) (B) For each one, write down 2 sentences describing what you learn