Atomic Nature Of Matter

Front 1

Atoms

Back 1

Atoms are the building blocks of matter.

Front 2

Element

Back 2

A material composed of only one kind of Atom is called an element.

Front 3

Brownian motion

Back 3

Brownian motion is evidence that atoms exist, as it results from the motion of neighboring atoms and molecules. They bump into the larger particles we can see.

Front 4

Molecule

Back 4

A molecule is the smallest particle of a substance consisting of two or more atoms that belong together by sharing electrons.

Front 5

Compound

Back 5

A compound is a substance that is made of atoms of different elements combined in a fixed proportion.

Front 6

Chemical formula

Back 6

The chemical formula of the compound tells the proportions of each kind of atom. For example, in the gas carbon dioxide the formula CO2 indicates that for every carbon atoms there two oxygen atoms

Front 7

Nucleus

Back 7

Almost all of an atom's mass is packed into the dense central region called the nucleus.

Front 8

Nucleons

Back 8

The principal building blocks of the nucleus are nucleons.

*Nucleons in an electrically neutral state are neutrons.

*Nucleons in an electrically charged state are protons.

*Atoms differ from one another by the number of protons.

*Atoms with the same number of protons are Atoms of the same element.

Front 9

Neutrons

Back 9

Nucleons in an electrically neutral state are neutrons.

Front 10

Protons

Back 10

Nucleons in an electrically charged state are protons.

Front 11

Isotopes

Back 11

Atoms that are the same element having different numbers of neutrons are called isotopes of that element.

Front 12

Atomic number

Back 12

Atoms are classified by their atomic number, which is the number of protons in the nucleus.