Chemistry Science stuff
Terms
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- mercury
- Hg
- iodine
- I
- nitrogen
- N
- Thomson
- called the charged particles with less massthan an atom "electrons"
- hydrogen
- H
- nickel
- Ni
- Bohr
- model of the atom: electron cloud
- phosphorus
- P
- Thomson
- to accomodate for the electron discovery, claimed the atom was a solid mass with electrons scattered throughout it
- Becquerel
- noticed that uranium compund fogged a photographic plate
- Becquerel
- experiments with uranium gave evidence for the existence of electorns
- radiation
- uased to describe any form of energy, like heat, light or small beam particles, given off by an object
- sodium
- Na
- Dalton
- model of atom: billard ball
- Greeks
- more than 2400 years ago discussed the idea of atoms
- carbon
- C
- Greeks
- had the idea to cut something so small it could not be cut again but, still retain its original properties
- Bohr
- helped explain the arrangement of electrons
- sulfur
- S
- Greeks
- first to propse the existence of atoms
- Rutherford
- model of the atom had mostly empty space
- Becquerel
- discovered that uranium is radioactive
- Chadwick
- discovered the neutron
- Rutherford
- noticed that the atom seemed heavier that it should be based on the number of protons but, didn't understand where the extra mass was coming from
- beta particle
- a high-speed electron given off by a radioactive substance
- geigercounter
- a device that produces an electric current whenever radiation is present
- Rutherford
- said the atom had a dense center with a positive charge because alpha particles deflected from the center
- lead
- Pb
- Dalton
- observed that gases of air could only be compresses so far
- Rutherford
- used uranium and thorium to observe three types of radiation
- chlorine
- Cl
- calcium
- Ca
- atom
- building blocks of matter
- alpha particles
- positively charged particles given off by a radioavtive substance
- aluminum
- Al
- alpha
- radiation that is affected by a magnetic field
- Bohr
- observed that because an electon's mas is so small, can't tell exactly where it is found in the atom
- electron
- particles that are smaller than the atom
- zinc
- Zn
- beta
- radiation that contains negatively charged particles
- Rutherford
- suggested that the electrons werescattered in the empty space surronding the tiny dense nucleus
- Chadwick
- student of Rutherford
- Crookes
- noticed that the green glow in the vacuum tube cast a shadow in a straight line
- unstable element
- an element that breaks apart on its own
- Rutherford
- thought that the nucleus contained poistively charge particles called protons
- radioactivity
- the release of high-energy particles by radioactive elements
- Rutherford
- conducted experiments using gold foil
- Chadwick
- accounted for the extra mass in the atom by discovering the protons give an atom its mass
- Bequerel
- concluded that the radiation given off by uranium was made of the same tiny particles found in the vacuum tube
- Thomson
- model of an atom: blueberry muffin
- Rutherford
- stated that " An atom is mostly empty space, with a dense positively charged center
- Chadwick
- named the neutron
- Thomson
- discovered the electron
- Dalton
- the particles(or atoms) that make up matter are solid and indestructable
- Greeks
- named the atom after the word "indivisible"
- copper
- Cu
- Dalton
- concluded that air must be made of particles and all matter was made up of particles
- silicon
- Si
- helium
- He
- potassium
- K
- Bohr
- model of the atom represents probable locations of electrons in the atom
- oxygen
- O
- Becquerel
- observed that radiation given off by uranium is deflected by magnetism
- tin
- Sn
- Thomson
- won Noble Prize in Physics
- uranium
- U
- gold
- Au
- Chadwick
- figured out that uncharged particles with a similar to that of a proton were in the nucleus of an atom
- Rutherford
- named alpha, beta, and gamma radiation
- Crookes
- connected vacuum tube to battery and noticed a greenish glow
- Crookes
- experimented with vacuum tube first
- Rutherford
- named the "proton"
- magnesium
- Mg
- Thomson
- attached a cathode-ray tube to a battery and observed that the greenish glow of particles bent when exposed to magnetic or electric fields
- cathode ray tube
- what the vacuum tube was later called
- Rutherford
- named the three types of radiation after the forst three letters of the greek alphabet
- gamma rays
- electromagnetic radiation that is highly penetrating and can be stopped by lead
- Crookes
- observed that the greenish glow in the vacuum tube moved from the negative end towards the positive end
- Thomson
- observed the greenish glow of particles in the vacuum tube had less mass than an atom
- iron
- Fe
- Chadwick
- resulted in a change to the electron cloud model of the atom to include both protons and neutrons in the atom's nucleus
- Rutherford
- shot alpha particles at gold foil
- silver
- Ag
- vacuum tube
- sealed class tubewith the air removed
- Bequerel
- left uranium compound on top of a photographic plate