Radioactivity Flashcards
What does the radioactive symbol indicate?
Radioactive materials are present and you must take extra precauciones to be safe
Define: Theory
An idea or set of ideas intended to explain facts or events
Who first proposed their atomic theory in an 1804 lecture at the Royal Institution?
John Dalton
What did John Dalton do?
He first proposed his atomic theory in an 1804 lecture to the Royal Institution
What is an element?
Simplest form of matter and has a unique set of properties
What is an isotope?
Atoms of an element that have the same amount of protons but different number of neutrons.
Carbon-14 : 6p and 8p
Carbon-12: 6p and 6p
What is Chemistry?
A branch of science that studies the compositions of matter and the changes it undergoes.
In 1895, who produced great interest in what caused the phenomenon of x-rays?
Wilhelm Röntgen
What did Wilhelm Röntgen do?
In 1895, he produced great interest in what caused the phenomenon of x-rays
What was Henri Becquerel’s contribution to Natural Radioactivity?
He studied the fluorescent properties of uranium salts.
He showed that Uranium salt emissions could be affected by a magnetic field which to x-rays, was not true
Who studied the properties of uranium salts with the express purpose of identifying the details of these emissions?
Pierre and Marie Curie
What did Pierre and Marie Curie do?
They studied the properties of uranium salts with the express purpose of identifying the details of these emissions
What are nuclear reactions?
Reactions that change the nucleus of an atom
Explain the term: Radioactivity
When unstable nuclei begin to decay which causes the release of energy in the form of particles or electromagnetic waves
What is a photon?
Particles of electromagnetic radiation that has zero mass and carries a quantum of energy
