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Old Atomic Theory
Modern Atomic Theory
Mendeleev's Table
Modern Periodic Table
Elemental Cliques
100
J.J. Thompson demonstrated that electrons have this with his cathode ray tube and charged plate.
What is a negative charge?
100
Almost all of the MASS of an atom is located here.
What is the nucleus?
100
The elements in Mendeleev's periodic table were organized by this (atomic mass, atomic number, alphabetically)
What is atomic mass?
100
The number of periods in the periodic table
What is seven?
100
Elements that have the same number of valence electrons are in this same type of category on the periodic table.
What is a group?
200
According to Dalton's Atomic Theory, an atom is this
What is the smallest particle of an element.
200
This subatomic particle has a negative charge, and is not located in the nucleus
What is an electron?
200
The discovery of this element supported Mendeleev's decision to leave gaps in his table
What is gallium/germanium?
200
Elements are arranged on the modern periodic table according to these.
What are atomic numbers?
200
The most reactive group of metals
What are the group 1A (alkali metals)?
300
He was one of the first people to state that matter is made up of atoms ( I mean atomos)
Who is Democritus?
300
This is the smallest of the three subatomic particles.
What is an electron (-)?
300
Besides their relative masses, Mendeleev also knew this about the elements he organized into a table.
What are properties?
300
This type of element is shiny and conducts electricity really well
What is a metal?
300
The group of elements that are all gases at room temperature. (Hint: Extremely nonreactive)
What is group 8A (Noble Gases)?
400
His gold foil experiment proved that atoms contain a densely packed positively charged region (later named the nucleus)
Who is Rutherford?
400
All the atoms of a particular element have the same number of these type of subatomic particles
What are protons (+)?
400
Mendeleev left these on his table because he grouped the elements by their properties.
What are empty spaces?
400
This SI unit is basically one twelfth of a carbon-12 atom.
What is an atomic mass unit (amu)?
400
The most reactive group of nonmetals
What is group 7A (Halogens)
500
He provided the first evidence that atoms were made of even smaller particles (sub-atomic)
Who is JJ Thompson
500
This is the number of protons,electrons, and neutrons in a neutral atom of Sulfur-34
What is 16 protons, 16 electrons, and 18 neutrons?
500
The name Mendeleev game the element he predicted would go below aluminum on his periodic table?
What is eka-aluminum?
500
Copper, silver, and gold, are all this type of metal.
What is transition metal?
500
The number of valence electrons in a neutral atom of the element with 84 protons/electrons
What is six?