Aca 8 Ch.4 Atomic Structure

Front 1

Dalton's Theory

Back 1

Theory that proposed that all matter is made up of individual particles called atoms, which cannot be divided.

Front 2

Dalton's model of the atom

Back 2

Each type of atom is represented by a tiny, solid spheres with a different mass.

Front 3

Thomson's model of the atom

Back 3

The model of the atom in which the negative charges are evenly scattered throughout a positively charged mass of matter (Plum Pudding, or Chocolate Chip Model).

Front 4

Thomson's Experiment

Back 4

Glass tube experiment which provided evidence for subatomic particles.

Front 5

Rutherford's Experiment

Back 5

Gold foil experiment that lead to the discovery of the nucleus.

Front 6

Rutherford's model of the atom

Back 6

The model of the atom that proposed that all of the atom's positive charge is concentrated in its nucleus.

Front 7

nucleus

Back 7

A dense, positively charged mass located in the center of the atom.

Front 8

proton

Back 8

A positively charged subatomic particle found in the nucleus of an atom.

Front 9

electron

Back 9

A negatively charged subatomic particle that is found in the space outside the nucleus of the atom.

Front 10

neutron

Back 10

A neutrally charged subatomic particle that is found in the nucleus of the atom.

Front 11

atomic number

Back 11

The number of protons in an atom of an element.

Front 12

mass number

Back 12

The number of the protons and neutrons in the nucleus of an atom.

Front 13

isotopes

Back 13

Atoms of the same element that have different numbers of neutrons and different mass numbers.

Front 14

energy levels

Back 14

The possible energies that electrons in an atom can have.

Front 15

electron cloud

Back 15

A visual model of the most likely locations of the electrons in an atom.

Front 16

orbital

Back 16

A region of space around the nucleus where an electron is likely to be found.

Front 17

electron configuration

Back 17

The arrangement of electrons in the orbitals of an atom.

Front 18

ground state

Back 18

A condition in which all of the electrons in an atom have the lowest possible energies.

Front 19

Bohr's model of the atom

Back 19

The model of the atom which focused on the arrangement of electrons around the nucleus.