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HISTORY
NUCLEONS
PROPERTIES
ISOTOPES
PERIODIC TABLE
100
First arranged elements in a systematic, logical way by increasing atomic mass.
Who is Dmitri Mendeleev.
100
This subatomic particle carries one unit of negative charge.
What is an electron.
100
The particle with 1/1840th the mass of a Hydrogen atom.
What is an electron.
100
This particle makes one isotope of an element different from another isotope of the same element.
What is the neutron.
100
The current arrangement of the elements in the periodic table.
What is the atomic number
200
Experiment that led to the discovery of the nucleus.
What is the Gold Foil experiment.
200
According to one part of this theory, atoms of the same element are identical.
What is Dalton's second part of the Atomic Theory.
200
This number represents the number of protons.
What is the atomic number.
200
This isotope has an atomic number of 24 and 26 neutrons.
What is chromium-50.
200
The horizontal rows of the periodic table.
What are the periods.
300
Credited in 1897 with the "Plum Pudding" Model of the atom.
Who is J.J. Thompson.
300
Location of the proton.
What is the nucleus.
300
This particle has a relative charge of 1+.
What is a proton.
300
This is a reference isotope chosen as a standard for the atomic mass unit.
What is carbon-12.
300
The vertical column of elements in the periodic table.
What are the groups or families.
400
English physicist J. Chadwick in 1932 confirmed the existence of this subatomic particle.
What is the neutron.
400
The smallest particle of an element that retains the properties of that element.
What is an atom.
400
This number depends on the number of protons and neutrons.
What is the mass number.
400
This isotope is composed of only one proton and one electron.
What is hydrogen-1.
400
These elements have high electrical conductivity.
What are the metals.
500
American chemist who in 1916 determined the mass of the electron.
Who is Robert Millikan
500
The component particles that scientists have discovered within atoms.
What are protons, neutrons and electrons.
500
This element has 79 electrons.
What is Gold.
500
The explanation as to why and element can have an atomic mass unit in fractions, like 35.453 amu for Chlorine.
What is the relative abundance of the naturally occurring isotopes.
500
The representative elements include this group because they exhibit a wide range of physical and chemical properties.
What are the Group A elements.