SNC1D3 - The Structure of the Atom & Bohr- Rutherford Diagrams
Atomic Theory Summary: - the atom is the smallest particle of matter.
History of the Atom Continued
JJ Thomson (1897) – _________________ theory
- _____________________ distributed in a positive sphere
- _____________________ used to measure the mass of the electron
Ernest Rutherford (1911) – discovered that atoms have a ___________________
- ____________________ Experiment
- positive charge due to ____________________
James Chadwick (1932) – within the nucleus there are protons and ____________
Niels Bohr – came up with the current model of the atom taught in Grade 9 and 10
Science; Bohr-Rutherford Diagrams
Bohr-Rutherford Model
1.
2.
RULES FOR DRAWING B-R Diagrams
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First orbital can hold a maximum of 2
Second orbital can hold a maximum of 8
Third orbital can hold a maximum of 8
Fourth orbital can hold a maximum of 18
Standard Atomic Notation
1. Write the symbol of the element
2. Write the mass number at the top left
3. Write the atomic number at the bottom left
Ex
Magnesium
Ex Lithium
Bohr Rutherford Diagrams
1. Draw the nucleus.
2. Put the number of protons and neutrons in it.
3. Add the electrons in their appropriate shells (2 max in the first shell, 8 max in the second
shell, 8 max in the third shell, and 18 max in the fourth shell)