Number of protons in an element
Atomic Number
Number of protons and neutrons in an atom
Atomic Mass
Ion
Element class
Metal
Energy Levels
4
When two or more atoms are chemically joined together
Molecule
Negatively charged particles in the atom
Electrons
Neutrally charged particles in the atom
Neutrons
Group number
2
Common name for element group
Alkaline Earth Metals
Electrons in the outermost energy level
Valence electrons
A negatively charged atom
Anion
DOUBLE JEOPARDY: Explain why there are three lines between the two balls in the ball and stick model.
It shares 3 electrons, triple bonded
Atomic Number
20
State of matter at room temperature
solid
Atoms with a different number of neutrons
Isotope
When two or more different types of atoms are chemically joined together
Compound
Electrons are found in this part of the atom
Electron Cloud
Number of valence electrons
2
Period number
4
A positively charged atom
Cation
Positively charged particles in an atom
Protons
Protons and neutrons are found in this part of the atom
Nucleus
Number of protons
Number of neutrons
Number of electrons
Neutrons - 20
Electrons - 20
Mass number
40