History
The person who first named the atom.
Who is Democritus?
The subatomic particle that has a positive charge.
What is proton?
This group does not naturally react with other elements.
What are Noble gases?
The number of energy levels an atom has is equal to this.
What is its period number?
The total number of protons and neutrons is represented by this.
What is the mass number?
Describe the 3 forces that subatomic particles have on each other.
Attractive force between the (+) nucleus and (-) electron cloud. Holds atom together.
Repulsive force between (-) electrons. Gives electron cloud volume.
Repulsive force between (+) protons. An insane amount of energy holds the nucleus together.
Who is Mendeleev?
The negative particles that are outside the nucleus.
What are electrons?
The most reactive metals.
What are alkali metals?
The semi-conductors on the periodic table are classified as these.
What are metalloids?
Isotopes are atoms of the same element with different numbers of these particles.
What are neutrons?
He came up with the model that says electrons travel in fixed orbits around the nucleus.
Who is Bohr?
The charge of a neutron.
What is 0 or neutral?
The most reactive nonmetals.
What are halogens?
What is atomic number?
This is the only noble gas that does not have 8 valence electrons.
What is helium?
The experiment that Rutherford used to develop his Nuclear Model.
What is the Gold foil experiment?
The number of electrons that can be held in the first energy level.
What is 2?
All elements in this group have 2 valence electrons. (group name)
What are alkaline earth metals?
Hydrogen's most common isotope has ____ protons and _______ neutrons.
1 proton
0 neutrons
Draw a Bohr Model for the most common isotope of sulfur.
16 p+
16 n0
16 e-
3 energy levels
6 valence e-
Explain JJ Thomson's Plum Pudding Model.
The atom is positively charged with negative particles embedded throughout.
The mass of the atom is in the _________ where the ____________ and ___________ are.
The volume of the atom is in the _____________ where the ____________ are.
Nucleus
protons and neutrons
Electron Cloud
Electrons
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).
What is hydrogen?
This element has 4 energy levels and is one of the rare earth metals.
What is scandium?
Write the two types of isotope notation for the most common form of sodium in nature.
Sodium-23
23Na