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
The number of protons and neutrons is represented by the…
Mass Number
First person to work on the periodic table
Mendeleev
The charge of a neutron
Neutral (0)
The most reactive metals.
Alkali Metals
The semi-conductors on the periodic table are classified as…
Metalloids
Isotopes are atoms of the same element with different numbers of _____
Neutrons
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
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
Hydrogen’s most common isotope has ___ proton(s) and ___ neutron(s).
1 proton; 0 neutrons
How many valence electrons does Neon have?
8
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
Write the two types of isotope notation for the most common form of Sodium in nature.
Sodium-23 & 23Na