U4 Atom Vocabulary Flashcard

Greek philosopher , he developed atomic theory originated by his teacher , Leucippus , that explained the natural phenomena in terms of the arrangement and rearrangement of atoms moving in a void
was an English chemist, meteorologist and physicist. He is best known for his pioneering work in the development of modern atomic theory, and his research into colour blindness
developed the use of the cathode ray tube in the study of the atom
Discovered electron by using the cathode ray to tell eletrical charges Plum Pudding Model.
Scientist that discovered the existence of the neutron
Scientist who established the Heisenberg uncertainty principle which states that it is fundamentally impossible to know the velocity and position of a particle at the same time
Subatomic particles
Particles which are smaller than the atom- that the atom is split into, such as protons, neutrons, and electrons
Cathode ray
radiation that originates from the cathode(-) and travels to the anode(+) of a cathode ray tube. Used in television sets and produces the color you seeon the screens.
mass number
The integer nearest to the atomic weight of an atom and equal to the numbers of nucleons (protons, neutrons, and electrons added together) in the nucleus of an atom
Relative Atomic Mass
Also known as r.a.m- Ratio of the average mass of atoms of an element to one-twelfth of the mass of an atom of Carbon-12.
Beta Particle
High energy particle created by radioactive emission. The symbol is a B. Created by splitting a nuetron into a proton and electron. Middle energy of the 3 particles released by radiation
High-energy radiation. Has no mass. Symbol is Y.
Nuclear Reactor
A device set up to create and maintain a nuclear reaction for the production of energy.
atomic mass unit
indicates mass at a molecular state. 1 amu is 1/12 of Carbon atom.

It is a different form of the same element; it is an atom with a different number neutrons but same number of protons in relation to the atom’s element’s natural state. Ex: Carbon-1w and Carbon-14

C-12 is natural (element form), and C-14 is radioactive. The numbers represent the number of neutrons in that isotope.

Alpha particle
A helium nucleus emitted by some radio active substances, originally regarded as a ray
Madame Curie
French-polish scientist know for advances in radiology discovered radioactive particles. Discovered Radium and Polonium.
Combining lighter atomic nuclei to form a heavier nucleus. Energy is released.
the process in which energy is emitted as particles or waves.
A nuclear reaction or radioactive decay process in which the nucleus of an atom splits into smaller parts releasing energy and producing free neutrons and photons
british physicist who discovered the atomic nucleus anf proposed a nuclear model of the atom.
Atomic Theory
The theory that states that:
-matter is broken up into smaller units called atoms
-these atoms are indivisible
-all atoms of the size element will have the same size, mass, and other properties
-atoms of different elements are different
-in compounds the atoms are combined in whole-number ratios
-and that in a chemical reaction, atoms are combined, rearranged, or separated
Madame Curie
Discovered polonium and radium. Medical revolution
Hungarian scientist that created the quantum mechanical model of the atom. This model displays the electrons in waves and displays the relative position of an electron around a nucleus based off of its energy level.

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