Download Cornell Notes: The Atom! Atoms are made of smaller particles called

Cornell Notes: The Atom!
Atoms are made of smaller particles called:
Subatomic particles
Protons are located where:
Nucleus
Protons are what charge?
+/positive
Protons have a mass of:
1 AMU (atomic mass unit)
Neutrons are located where?
Nucleus
Neutrons are what charge?
0/neutral
Neutrons have a mass of:
1 AMU
The overall charge of the nucleus is:
+/positive
Electrons are located where?
Electron cloud
Electrons are what charge?
-/Negative
What is mass of electron?
.001 AMU (super light)
What is overall charge of electron cloud?
-/negative
What makes up most of atom’s mass?
Nucleus
Normally the # of protons and electrons is:
=/equal
If # of protons = # of electrons, the overall charge of atom is:
0/neutral
The atomic number tells me
The number of protons
The mass number tells me
The # of protons and neutrons
How many electrons can fit in 1st shell of electron cloud?
2
How about the 2nd?
8
How about the 3rd?
8
What are valence electrons?
Electrons in outermost occupied shell
Why are valence electrons important?
They determine reactivity/stability of the atom
What is reactivity?
How an atom reacts w/other atoms
If an atom is reactive it will:
React/bond with other atoms
If an atom is stable it will:
Not react with other atoms
Reactive atoms do not have
Full valence/outermost shells
Stable atoms:
Do have full valence/outermost shells