Do Now: Take out notebook and pencil Start a new Do Now page on page 48 At top of page write Do Nows for week of 1/8 What is an atom? What makes up an atom?

Quick Action – Atom INB Template Checking for Understanding Cut out the INB template including all solid lines. Fold on the dotted line. Paste the solid back into your notebook so that you have a flipable. On the top inside part of each section draw the structure of an atom showing the charge and location of the particle. On the bottom write notes including the charge, the location and the mass of each particle. © KeslerScience.com

Protons- positively charged particle Located inside nucleus Atomic number = # of protons Determines element’s identity

Neutrons- particles with NO charge Located inside the nucleus Included in the atom’s mass

Electrons- negatively charged particles Located outside the nucleus in the electron cloud So small it barely adds to the mass Usually equal to the number of protons

Atoms Periodic Table This table shows all the different atoms there are on Earth. It’s called the Periodic Table of Elements. Remember, an atom is the basic unit of a chemical element. Let’s take a closer look at one atom(element). © KeslerScience.com

We can determine properties of atoms using the periodic table: Atomic number (whole number) tells us the number of protons and electrons (always equal to the atomic number) Atomic mass (number with decimals) helps us determine how many neutrons present Mass – atomic number = neutrons

APE and MAN to determine properties of atoms

Quick Action – Atom INB Template Checking for Understanding Cut out the INB template and paste tab in notebook. This is a way for you to remember how to calculate subatomic particles. “Ape Man”. A = Atomic Number P = Proton E = Electron All are equal is a neutral atom. M = Mass Number A = Atomic Number E = Neutrons M – A = N © KeslerScience.com

Atoms 1. The element’s (atom’s) name. Nitrogen 2. The symbol for nitrogen. (N) 3. The number of protons (7), which is also referred to as the atomic number. 4. The atomic mass (14.007). (protons + neutrons = atomic mass) 5. How can we determine the number of neutrons in nitrogen? Hint: atomic mass (14) – atomic number (7)= neutrons What can we tell about this atom (element) from the PT? N 7 14.007 Nitrogen © KeslerScience.com

Quick Action – Atom Practice Grab a partner and let’s practice. Do the math! Element (atom) Protons Neutrons Mass Carbon ? 6 12 Beryllium 4 5 10 Magnesium 24 Make up 4 problems of your own asking for the element name, #of protons, neutrons and electrons. © KeslerScience.com

Worksheet