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3.3 Parts of an Atom Handout and highlight

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Parts of an Atom

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**Proton, Electron, and Neutron chart**

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**What is the name of atom A? Hydrogen What is the name of atom B? **

Oxygen 8 1 8 none 1 8 16 1

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**Subatomic Particles (Protons, Neutrons, and Electrons)**

The number of protons in an atom is called the atomic number. If you know the atomic number of an atom, you know how many protons – and how many electrons – the atom contains. # of protons = # of electrons (e-) The mass number is the sum of protons and neutrons in the atom.

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Therefore, if you know the atomic number (the number of protons) and the mass number (the sum of protons and neutrons), you can easily calculate the number of neutrons. Number of Neutrons = mass number – atomic number

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**Standard Atomic Notation**

We represent the numbers of subatomic particles by using standard atomic notation. 35 (35 = mass #) Example Cl (Cl = chemical sym.) 17 (17 = atomic #) # of protons = # of electrons (e-) = # of neutrons =

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At# = #P = # E At Mass = #P + #N #N = At mass – At#

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Counting Atoms Review CaCO3 NaNO3 NaCl C9H8O4 C2H4O2

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**Handout BLM 3.3 Subatomic Particles worksheet**

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Directions: 1. Use the Periodic Table to find the Atomic Number (#) and Mass Units for that element. 2. Calculate the number of protons, electrons, and.

Directions: 1. Use the Periodic Table to find the Atomic Number (#) and Mass Units for that element. 2. Calculate the number of protons, electrons, and.

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