Scientists
Who created the theory of evolution?
What is Charles Darwin?
What is the small area in the center of an atom in which most of an atom's mass and positive charge is concentrated?
What is the nucleus?
What term describes elements that spontaneously emit radiation?
What is radioactive/radioactivity?
What is the term for the area that electrons are most likely to be found around the nucleus?
What is the electron cloud?
What is an atom that is no longer neutral because it has gained or lost electrons?
What is an ion?
Who believed matter is made up of small indivisible objects named atoms?
What is Democritus?
What are the particles with the least to most charge? (aka the 3 subatomic particles)
Format: ( What is an ___, ____, and ___?)
What is an electron, neutron, and proton?
Who first studied minerals containing the element uranium?
What is Henri Becquerel?
What is the term for the number of protons in an element?
What is the atomic number?
The tool that enabled scientists to see individual atoms for the first time.
What is scanning tunneling microscope?
Who proposed that electrons move in circular orbits, or energy levels, around the nucleus?
What is Niels Bohr?
What happens to an atom when it releases an alpha particle?
What happens when the atomic number decreases by two by releasing two protons and neutrons?
Which group of people discovered that the radiation released by uranium was made of energy and particles?
What is Henri Becquerel and the Curies?
What is the term for any of two or more atoms of the same element that have different numbers of neutrons?
What is an isotope?
During a certain scientist's experiments by shooting particles directly through a piece of golden foil, what surprised him?
What is a particle bounced straight back?
Which scientist set up an experiment to observe alpha particles by shooting them into a thin piece of gold foil, and discovered the atoms and that most of an atom is empty space?
What is Ernest Rutherford?
What is the process by which a neutron in an atom changes into a proton and a high-energy electron called a beta particle, and the atomic number increases by one because it has gained a proton?
What is beta decay?
What happens when uranium releases radiation?
What happens when uranium changes into a different element?
What is the term for the sum of the number of protons and neutrons in an atom?
What is the mass number?
What two things are released during radiation?
What are particles and energy?
In order, who discovered the electron, neutron, and protons? Format: (What is ___ discovered the electron, ___ discovered the neutron, and ____ discovered the proton?)
What is J.J. Thomson discovered the electron, James Chadwick discovered the neutron, and Ernest Rutherford discovered the proton?
What type of nuclear decay releases what rays that do not contain particles and do not change one element into another element?
What is gamma decay and gamma rays?
What is the process that occurs when an unstable atomic nucleus changes into another more stable nucleus by emitting radiation?
What is nuclear decay?
What is the term for the average mass of an element's isotopes, weighted according to the abundance of each isotope?
What is the average atomic mass?
Which tool allowed a certain scientist to discover the electron?
What is a cathode ray tube?