Unit Four Vocabulary

Front 1

Atom-

Back 1

The basic building block of matter.

Front 2

Atomic Number-

Back 2

The number of protons in the nucleus of an atom.

Front 3

Bohr Diagram-

Back 3

Diagram that shows the # of protons and neutrons in a nucleus that orbit energy levels and electrons.

Front 4

Chemical Symbol-

Back 4

A code for each element usually from it's name.One to three letters.

Front 5

Electron-

Back 5

A stable subatomic particle negatively charged with electricity.Moves in an orbit shell outside an atom's nucleus.

Front 6

Energy Level-

Back 6

The fixed amount of energy something has.Electrons are found around an atom's nucleus,energy level.

Front 7

Family-

Back 7

A group of objects unified by a significant characteristic.Verticle column on periodic table.

Front 8

Isotope-

Back 8

A radioactive form of an element.atoms of the same element that have different #s of neutrons in their nuclei.

Front 9

Mass Number-

Back 9

Total number of protons and neutrons in a nucleus.

Front 10

Metalloids-

Back 10

An element intermediate between properties of metals and non-metals.

Front 11

Metal-

Back 11

Solid material that is typically hard,shiny,and malleable,ductile,and a good conductor of electricity.Any element on the left side of the periodic table except Hydrogen.

Front 12

Neutron-

Back 12

A subatomic particle about the same mass as a proton;not charged with electricity.

Front 13

Non-metal-

Back 13

An element or substance that is not a metal.

Front 14

Nucleus-

Back 14

The simple,most important part in an object,movement.or group.Control center.

Front 15

Period-

Back 15

A set of elements occupying an entire horizontal row in the periodic table.represents energy level.

Front 16

Periodic Table-

Back 16

A table of chemical elements arranged by atomic number.Grouped according to similar properties.

Front 17

Proton-

Back 17

A stable subatomic particle occurring in all atomic nuclei.Has the same mass as a neutron but with the opposite sign.Positive.