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 gasses / group 18
The period number tells you
Number of energy levels
The number of protons and neutrons is represented by the
Mass number
First person to work on the periodic table, organized it by atomic mass
Mendeleev
The charge of a neutron is
0 or neutral
The most reactive metals
Alkali metals / group 1
The semi-conductors on the periodic table are classified as
Metalloids
Isotopes are atoms of the same element with different numbers of
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 / group 17
Which number can be used to determine the identity of an element
Atomic number
What noble gas does not have 8 valence electrons
Helium
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 / group 2
Hydrogen's most common isotope has _____ proton(s) and ______ neutron(s)
1 proton, 0 neutrons
Draw a Bohr model for the most common isotope of sulfur
16p, 16n, 16e
Explain JJ Thomson's Plum pudding model
A positively charged atom that has negative particles embedded throughout
The mass of an atom is in the __________ where the ____ and ____ are.
The volume of the atom is in the __________________ where the ____ are.
Nucleus, protons, neutrons
Electron cloud, electrons
This element is the only one in its group that belongs with the group # (because it has the same # of valence electrons) but not with the group name
Hydrogen
This element has 4 energy levels and is one of the rare earth metals
Scandium
Write the two types of isotope notation for the most common form of sodium in nature
Sodium-23
23Na