-------is the smallest unit of matter that establishes the unique characteristics of a substance ?
- Elements
- Molecule
- Atom
When electrons move freely from atom to atom or compound to compound, the substance is known as a ---------------?
- Conductor
- Non conductor
- Insulator
Materials made up of two or more elements that have chemically bonded are known as --------------?
- Elements
- Compounds
- Mixtures
to.---------- are a ms and molecules that are physically mixed together but are not chemically bonded?
- Elements
- Compounds
- Mixtures
The movement of --------------- is known as electric current or current flow?
- Electrons
- Protons
- Neutron
An --------------------------- has a negative electrical charge?
- Electron
- Protons
- Neutron
The---------------- has a positive electrical charge?
- Electron
- Protons
- Neutron
A ----------------- has no electrical charge?
- Electron
- Protons
- Neutron
Orbiting around the nucleus is a third kind of subatomic particle called----------------?
- Electron
- Protons
- Neutron
Most --------used in aviation are compound of two or more elements that share electrons to fill their valence shells?
- Insulators
- Conductor
- Non conductor