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44 Cards in this Set

  • Front
  • Back

What are subatomic particles





Charge of +1

Mass of 1 amu

Found in nucleus

What is amu

Atomic mass unit


Charge of -1

Mass of 0 amu (1/1800)

Found in the space outside a nucleus


Charge of 0

Mass of 1 amu

Found in nucleus

What is the atomic number

The number of protons found in the nucleus of an atom

(Also electrons)


Atoms of the same element, with the same number of protons, but different numbers of neutrons

Atomic mass

Protons + Neutron


When an atom loses or gains an electron


When substances spontaneously wmit radiation

Nuclear reactions

Reactions that involve a change in the atom's nucleus

The atom the one element can change into the atom of another element


The Ray's and particles emitted by the radioactive material

radioactive decay

unstable nuclei lose energy by emitting radiation in a spontaneous process (doesn't require energy)

alpha radiation

radiation that is positive

alpha particles

contains 2 protons and 2 neutrons, 2+ charge

nuclear equation

show the atomic number and mass number of particles involved

Beta radiation

Radiation that deflects towards the positively charged plate

Beta particles

Radiation that consists of fast-moving electrons called beta radiation

Electron with -1 charge

Gamma radiation

Gamma rays are high-energy radiation that possess no mass

No electrical charge

not deflected by electric or magnetic fields

Nuclear stability

An atom's stability is determined by its ratio of neutrons to protons

Electromagnetic radiation

Form of energy that exhibits wavelike Behavior as a travels through space

Examples of electromagnetic radiation

Visible light, microwaves, x-rays, radio, television waves


Shortest distance between equivalent points on a continuous wave

Units of wavelength

Meters, centimeters, nanometers


The number of waves that pass a given point per second


The waves height from the original to Crest or from origin to a trough

Electromagnetic spectrum

Encompasses all forms of electromagnetic radiation with the only differences in the types of radiation being their frequencies and wavelengths

Quantum theory

The description of the properties of atoms using wave properties

Based on the idea that we can only predict the probability of finding an electron in a particular position

Who's model is this and what is it called

Dalton's model

Marble model

What what Dalton's theory (marble model)

All matter is made of indivisible and indestructible atoms

Atoms of a given element are identical in their properties

Atoms of different elements have different properties

Law of multiple proportions

Law of multiple proportions

Atoms of different elements combine in simple whole number ratios to form compounds

What was Dalton's conclusion (marble model)

Law of conservation of mass

Law of conservation of mass

Atoms cannot be subdivided, created, or destroyed when they are combined, separated or arranged in chemical reactions

Who's model is this and what is it called?

J. J. Thompson's model

Plum Pudding model

What was J.j. Thompson's conclusion

Negatively charged electrons embedded and ball positive positive charge

Robert a millikan

Used Thompson's work to determine the exact charge and mass of an electron

Ernst Rutherford experment?

Gold foil experienment

Ernst Rutherford theory

The positive particles would deflect as they Struck the positive spheres of the plum pudding model atom

Ernst Rutherford conclusion

Most of the atom is empty space

Adams have a solid core called the nucleus

Nucleus are positively charged

They measure the approximate size of the nucleus

Rutherford model

Bohr model

Neil Bohr

Electrons would be found only in specific energy levels, similar to the rungs on a ladder

Energy levels closer to the nucleus have a lower energy from those further away

The difference in energy between anyone level and the next called a Quantum


basic unit of matter


a substance in which all the atoms are exactly the same