Chemistry Key Words Flashcards
Neutron
Particles with no charge
Found in nucleus
Weighs 1 atomic mass unit
Electron
Negatively charged
Found in shells
Weighs nothing.
Electron shells
Energy levels around the nucleus.
1st shell can take 2 electrons
2nd shell can take 8
3rd shell can take 8
Proton number (Atomic number)
Number of protons
Same as number of electrons
Mass number
Number of protons + number of neutrons
Electron configuration
Arrangement of electrons
Element
One type of atom only
Mixture
More than one type of atom, but not chemically joined
Proton
Positively charged particle.
Found in the nucleus
Weighs 1 atomic mass unit
Compound
More than one type of element, chemically joined by a bond
Conservation of mass
In a closed container, the mass of the reactants is the same as the mass of the products