The building blocks of matter!

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All matter is made of tiny particles called atoms

Atoms are the smallest part of matter

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Solid ball

Daltons Atomic Theory

All matter is made of atoms

Atoms of same element are same, of different elements are different

Atoms combine to form compound

Atoms can not be broken down

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Fixed electrons surrounded by positive material

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Central positive

center (nucleus)

Surrounded by

Electrons

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Positive center of protons and neutrons surrounded by electrons that travel in fixed orbits

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Positive nucleus surrounded by an electron cloud where electrons are likely found

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All matter is made up of atoms

Atoms can be broken down into smaller particles

Atoms combine to form compounds

*Atoms of the same element always have the same number of protons.

*Atoms of the same element can have different masses. These are called “isotopes.”

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Charge = positive 1 (+1)

Mass = 1 amu

Location inside nucleus

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The number of protons in the nucleus determines the atomic number.

Elements are arranged in the table by increasing atomic number

Does not change

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Charge = none (0)

Mass = 1 amu

Location inside nucleus

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The number of protons plus the number

neutrons within the nucleus

This helps identify the Isotope of the element (same Number of protons different number of neutrons)

AKA: Average Atomic Mass©2011 University of Illinois Board of Trustees • http://islcs.ncsa.illinois.edu/copyright

Represents the element name with the atomic number and mass number

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Charge = negative 1 (-1)

mass= 1/1836 of a proton

Location orbit around the nucleus

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An atom is a neutral particle

The net charge is zero

Number of electrons = Number of protons

16 protons = 16 electrons

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