History
Who first named the atom?
Democritus
Subatomic particle that has a positive charge
Protons
This group will never combine with any other element naturally.
Noble gases
The period number tells you…
Number of energy levels
he stability of an atom depends on the ratio between these two particles found in the nucleus.
Protons and Neutron
First person to work on the periodic table
Mendeleev
The charge of a neutron
0
The most reactive metals.
Alkali metals
The semi-conductors on the periodic table are classified as…
Metalloids
When an atom’s nucleus gives off particles or energy in order to become more stable, this natural process is occurring.
Radioactive decay
Came up with the model that says electrons travel in fixed orbits around the nucleus
Bohr
The particles that make up protons and neutrons
Quarks
The most reactive nonmetals.
Halogens
Which number can be used to determine the identity of an element?
Atomic number
This measurable quantity represents the time it takes for half the atoms in a radioactive sample to decay into more stable forms.
What experiment did Rutherford use to develop his Nuclear Model?
Gold foil experiment
How many electrons can be held in the first energy level?
2
All elements in this group have 2 valence electrons.
Alkaline earth metals
Hydrogen’s most common isotope has ________ proton(s) and ________ neutron(s).
1 proton
0 neutrons
When a neutron transforms into a proton, emitting a high-energy electron in the process, this transformation has occurred.
Beta radiation
Explain JJ Thomson’s Plum Pudding Model.
The atom is positively charged with negative particles embedded throughout
The mass of an atom is in the ____________ where the ____________ are.
The volume of the atom is in the ____________ where the ____________ are.
The mass of an atom is in the nucleus where the p+ and n0 are.
The volume of the atom is in the electron cloud where the e- are
This element is the only one in its group that belongs with the group # (due to having the same # of valence e-) but not with the group name (because it is a different classification)
Hydrogen
This element has 4 energy levels and is one of the rare earth metals.
Scandium
This form of radiation does not consist of particles at all but rather high-energy electromagnetic waves often released alongside other types of decay.
gamma radiation