Atomic Structure Chm 1.1.1

Matter

Matter

Mixtures Pure Substances

Compounds

Elements that are CHEMICALLY bonded togetherCan’t be separated by physical means

Elements

Made up of 1 type of atom

Atoms

• Smallest unit of matter

That has the characteristics of the element

What elements are made of

Regions of the Atom

Nucleus

Electron Cloud-Area surrounding the nucleus

NucleusSubatomic Particles:

Proton – mass = 1amupositive charge

Neutron – mass = 1amuno charge

Electron Cloud

Subatomic Particle:

Electron – mass = 0 amunegative chargeorbits the nucleus

Ions +

An atom with an electrical charge

cation

Ions - anion

Isotopes

Different number of neutrons = different mass

Isotope Designation

Carbon - 12

Atomic Number, Mass # and Atomic Mass

Atomic Number

Atomic Mass

Mass Number = 59