Atomic Theory Vocabulary

Front 1

Nucleus

Back 1

The nucleus is the dense, positively charged mass located in the center of an atom.

Front 2

Neutrons

Back 2

Neutrons are the neutral charged subatomic particle that's found in the nucleus of an atom.

Front 3

Protons

Back 3

Protons are a positively charged subatomic particle that's found in the nucleus of an atom.

Front 4

Electrons

Back 4

Electrons are a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Front 5

Isotope

Back 5

An isotope is each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.

Front 6

Atom

Back 6

An atom is the basic unit of a chemical element.

Front 7

Mass Number

Back 7

The mass number is the total number of protons and neutrons in a nucleus.

Front 8

Atomic Number

Back 8

the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

Front 9

Electron Cloud

Back 9

The electron cloud is the system of electrons surrounding the nucleus of an atom.

Front 10

Orbitals

Back 10

An orbital is a mathematically described region around a nucleus in an atom or molecule that may contain zero, one, or two electrons.

Front 11

Dalton's Atomic Model

Back 11

Dalton's atomic model is that all matter is made of atoms. Atoms are indivisible and indestructible. All atoms of a given element are identical in mass and properties.Compounds are formed by a combination of two or more different kinds of atoms.

Front 12

Thomson's Atomic Model

Back 12

Thomson's atomic model is the plum pudding model was a model of the atom that incorporated the recently discovered electron, and was proposed by J. J. Thomson in 1904. Thomson had discovered the electron in 1897. The plum pudding model was abandoned after discovery of the atomic nucleus.

Front 13

Rutherford's Atomic Model

Back 13

The experiments of the British physicist Ernest Rutherford in the early 20th century on the scattering of alpha particles from a thin gold foil established the Rutherford atomic model of an atom as consisting of a central, positively charged nucleus containing nearly all the mass and surrounded by a cloud of negatively charged planetlike electrons.

Front 14

Modern Atomic Model

Back 14

The current theoretical model of the atom involves a dense nucleus surrounded by a probabilistic "cloud" of electrons. In chemistry and physics, atomic theory is a scientific theory of the nature of matter, which states that matter is composed of discrete units called atoms.

Front 15

Nanotechnology

Back 15

Nanotechnology is the branch of technology that deals with dimensions and tolerances of less than 100 nanometers, especially the manipulation of individual atoms and molecules.