The smallest particle of an element that retains the properties of the element
What is an atom?
100
Negatively charged particles that float in the surrounding space around the nucleus
What is an electron?
100
This type of ray has no charge so it isn't allowed to bend in any way, shape or form.
What is gamma ray?
100
This philosopher believed that matter is composed of empty space through which atoms move and that atoms are solid, homogeneous, and indivisible.
Who is Democritus?
100
The number listed in the upper left corner which tells how may protons are in the element.
What is atomic number?
200
The accidental discovery of this led to the invention of one of the most important technological and social developments of the 20th century—the television.
What is cathode ray?
200
Positively charged particles that make up half of the nucleus.
What is a proton?
200
Each of these has two protons, two neutrons, and zero electrons, thus giving this a 2+ charge
What is alpha particle?
200
A schoolteacher in England, he was the man who developed the first modern day atomic model. He also stated that atoms cannot be created or destroyed.
Who is John Dalton?
200
This is listed as to what the element is. It's stated with one or two letters
What is chemical symbol?
300
A process where substances randomly omit radiation
What is radioactivity?
300
The other "half" of the nucleus. It determines whether an atom is stable or unstable
What is a neutron?
300
Each of these is an electron, thus making this have a -1 charge
What is beta particle?
300
One of the most influential philosophers, but most of his writings have been lost throughout time.
Who is Aristotle?
300
Lists what the particular element is
What is chemical name?
400
An atom that has the same number of protons, but different number of neutrons
What is isotope?
400
This is defined as 1/12 the mass of a carbon-12 atom
What is atomic mass unit?
400
There are, however, reactions that do involve an atom of one element changing into an atom of another element. These reactions, which involve a change in an atom’s nucleus, are called
What is nuclear reaction?
400
Proposed the famous plum pudding model, which looks like a chocolate chip cookie. This model stating that the electrons are the CCH chips and the protons and neutrons is the actual cookie itself.
Who is J.J. Thomson?
400
Listed just below the chemical name and explains how heavy the element is
What is mass number?
500
This type of equation shows the atomic number and mass number of the particles involved. It is important to note that both mass number and atomic number are conserved in it
What is nuclear equation?
500
A tiny, dense region which contains all of an atom's positive charge and almost all of the mass inside the atom.
What is nucleus
500
Unstable nuclei lose energy by emitting radiation in a spontaneous process (a process that does not require energy) is called this
What is radioactive decay?
500
Attended Cambridge Academy to study the transmission of the radio waves. He later turned to the field of radioactivity with Marie and Pierre Curie.
Who is Ernest Rutherford?
500
The result of mass (amu) and percent abundance multiplied together