1. Basic Chemistry Flashcards
The functional unit of matter
Atoms
Anything that occupies space and has mass
Matter
The core of the atom, consists of two kinds of subatomic particles
Nucleus
Positive charge
Proton
No charge
Neutron
99.9% of the atoms mass is found in _____
The nucleus
Negatively charged
Electrons
Electrons are found moving about the ____ at ____
- Nucleus
2. Tremendous speeds
These electrons are found in _____
The electron cloud
The electron cloud is broken down into separate sections called ____
Shells or levels
Each of the surrounding levels:
1st level _____
2nd level _____
3rd level _____
- ) 2 electron max
- ) 8 electron max
- ) 8 electron max
Electrons near the nucleus have ____ but those away from the nucleus have ____
- Lower energy
2. Higher energy
In an uncharged atom:
The number of protons = the number of ____
The charges ____ each other
The net charge on an atom is ____
Electrons
Offset
0
A substance that __________ into simpler kinds of matter is an element
Cannot be broken down chemically
Each element has a symbol, they are all represented in the ________
Periodic Table