Download FIB - myndrs.com

Science 10
Chemistry
Name:________________
Blk: _____
The Atomic Theory:
All matter is made of _________, which are particles too ______ to be ______.
Each __________ has its own kind of atom.
The evolution of the atomic Theory:
1. Dalton
2. Rutherford’s gold foil experiment
3. Bohr models
4. Quantum Mechanics
Sub Atomic Particles
Subatomic
Particle
Charge
Mass (AMU)
atomic mass units
Where it is located in
the atom.
Important Vocabulary:
Atomic number: The number of __________ in the nucleus of an atom of that
element.
–Gives the number of _________ in a ________ element.
–Gives the order of ___________ on the periodic table
–If an atom _______ or ________ a ___________ it not only changes its
atomic number, it also becomes a new _____________.
Mass number: is the total number of _________and __________ in the
__________ of an atom
How do we find the number of Neutrons?
(_______ number) - (_________ number) =# of neutrons
Bohr’s Model of Electrons:
Suggested that ______________ move around the nucleus of an atom in
_______ or shells.
Each orbit is a certain distance from the nucleus and contains a definite
number of electrons.
The orbits are filled in a routine way:
–First orbit: ___ electrons
–Second orbit: ___ electrons
–Third orbit: ___ electrons
Example1: Bohr model of Nitrogen:
Example 2: Bohr model for Magnesium:
Example 3: Bohr Model for Argon
Isotopes
Atoms of the ________ element that have different numbers of ____________.
Two ways to recognize isotopes:
1. Isotope Name: Chemical name – mass #
Example: ________________________________________________
2. Isotope Symbol:
Mass number
X ← chemical symbol of element
Atomic number
Example:
The Isotope symbol makes it easy to find the number of ___________.
Atomic mass:
The __________ average of the mass an element’s naturally
occurring___________.
A “weighted average” means you take into account the ____ of each
__________ that is present in an ordinary sample of the element.
Example: