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The 2,400-year search for the atom
What are Atoms Made of?
What Are The Different Atomic Models? Dalton, Rutherford, Bohr and Heisenberg Models Explained [ENRICHMENT]
Atomic Structure [ENRICHMENT]
Structure of atoms
Structure of atoms
All atoms are composed of a small positively charged nucleus containing protons and neutrons surrounded by a larger negatively charged electron cloud.
Atomic number
Atomic number
An atomic number (Z) is the number of protons present in the nucleus of an atom. Since an atom contains an equal number of protons and electrons, the atomic number also indicates the number of electrons present in an atom.
Atomic number (Z) = Number of protons = Number of electrons
Mass number
Mass number
A mass number (A) is the sum of the number of protons and neutrons present in the nucleus of an atom.
Mass number (A) = Number of protons + Number of neutrons
The number of subatomic particles present in an atom can be determined using its atomic number and mass number, as shown below.
Number of protons = Atomic number (Z)
Number of electrons = Atomic number (Z)
Number of neutrons = Massnumber (A) - Atomic number (Z)
Total number of subatomic particles present in an atom = Mass number (A) + Atomic number (Z)
Electron Configuration Diagrams
Electron Configuration Diagrams
Chapter 4.1 Activity 4
Write down your findings in the space below. Share your findings with the class.
Now that you understand electron configuration, examine the relationship of the elements in the periodic table.
What are isotopes?
Uses of radioactive isotopes
What Are Radioactive Isotopes?
Revised label of groups in Periodic Table
Revised label of groups in Periodic Table
Periodic table labeled with group names (from 1-18)
Ionic Bonds
Covalent Bonds
Concept of Covalent Bond
Carbon
Writing Ionic Formula
Writing Formula with Polyatomic Ions
Writing Chemical Formulae for Ionic Compounds
Balancing Equations
Naming Ionic Compounds with Transition Elements
Introduction to balancing chemical equations
Transition Metal
How to write for compounds with transition metals
Try the simulation of Balancing Chemical Equations
introduction
game
Practice Problems- Writing and Balancing Chemical Equations
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