vocab 1
positively charged electrode
anode
Region surrounding the nucleus where electrons flow
electron cloud
High energy electron that comes from the nucleus
beta particle
how many protons are in arsenic
33
he showed that Thomson's model of the atom was inaccurate
Rutherford
Atoms of the same element with different number of neutrons
isotopes
Consists of two protons and two neutrons
alpha particle
Changing of one element to another through radioactive decay
transmutation
how many electrons are in mercury
80
he showed that different elements are made up of different types of atoms
Dalton
Matter made up of atoms of only one kind
element
Number of protons plus neutrons
mass number
negatively charged electrode
cathode
how many neutrons are in mercury
120 or 121
he showed that cathode rays are made up of negatively charged particles
Thomson
Positively charged particle located in the nucleus
proton
Negatively charged particle not in the nucleus
electron
Amount of time it takes for half a sample of an element to decay
half-life
what is the mass of arsenic
75
he used the cathode-ray tube to discover streams of particles
Crookes
The release of nuclear particles and energy
radioactive decay
Particle with no charge found in the nucleus
proton
Number of protons in the nucleus of a given element
atomic number
If an element undergoes alpha decay, how many neutrons does it lose?
2
which one of the following particles has a different weight than the others
electron