# Atomic Structure

Atomic Structure What is an atom? Atom: the smallest unit of matter that retains the identity of the substance Atomic Structure Atoms are composed of 2 regions: Electro n

Cloud Nucleus The Nucleus Nucleus: the center of the atom that contains the mass of the atom The Nucleus contains Protons and Neutrons. Protons: positive charge Neutrons: neutral charge

The Electron Cloud Electron cloud: region that surrounds the nucleus that contains the space/volume in the atom Contains the Electrons Electron: negative charge Has relatively no mass An atom must be balanced!

In an atom: The # of protons = the # of electrons The neutrons have no charge; therefore they do not have to equal the number of protons or electrons How can we find the number of protons, neutrons, and electrons? Atomic number: this number

indicates the number of protons in an atom Atomic Mass: the number of protons and neutrons in the atom. This information is found on the Periodic Table Atomic Number

Atomic Mass 1 H Hydrogen 1.008 Symbol

Elements Name Calculating the neutrons How can we find the Neutrons? # of neutrons = mass # atomic # What about the electrons? The electrons are equal to the number of protons

Atomic # = protons = electrons Determining the number of protons, neutrons and electrons Li has an atomic number of 3 and a mass number of 7 Protons = ____ (atomic #) Neutrons= ____ (mass # - atomic #)

Electrons = ____ (electrons = protons) Ne has an atomic number of 10 and a mass number of 20 P = ____ N = ____ E = ____ How are the particles

arranged in an atom? The Bohr Model of the atom: 3rd ring holds up to 18 e4th ring holds up to 32 e- Nucleus protons and neutrons

1st ring holds up to 2 e2nd ring holds up to 8 e- What does Carbon (C) look like? Atomic # = 6 # = 12 Mass 6 p and 6 n live in the

nucleus p+ = 6 no = 6 e- = 6 What does Fluorine (F) look like? Atomic # = 9 = 19

Mass # 9 p and 10 n live in the nucleus p+ = 9 no = 10 e- = 9

Atomic Structure and Bohr Model Practice On the front Boron (B) Nitrogen (N) Calcium (Ca) Nickel (Ni) On the back Sodium (Na) Beryllium (Be) Neon (Ne)

Sulfur (S) Bohr Model Trading Cards Write your name on the bottom right corner of paper. Choose 2 elements (with an atomic # less than 92) from the Periodic Table. Write the info (atomic #, symbol, name and atomic mass) for those elements on the 2 papers provided. Bohr Model Trading Cards

Trade with 2 different people. Write your name in the bottom right corner and then draw the Bohr Model for that element on the back. Use a marker and trace over your Bohr Model. Make it look pretty Tape it up anywhere on the wall when you are finished.

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