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18 Cards in this Set

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Atom

The smallest unit that defines elements and their isotopes.

Atoms make up all elements

Atoms make up all elements

Atomic Mass

How much mass one atom of an element has.

One helium atom has a atomic mass of 4.003

One helium atom has a atomic mass of 4.003

Atomic Mass Unit

1/12 of the mass of a carbon atom. Used to measure atomic mass.

One helium atom has an atomic mass of  4.003 amu's

One helium atom has an atomic mass of 4.003 amu's

Atomic Number

The amount of protons in the nucleus of an atom.

The atom number of helium is 2

The atom number of helium is 2

Atomic Symbol

Atomic Symbol contains the element symbol, atomic mass and atomic number

Atomic symbol of helium has He, the number 2 over He and the number 4.003 below it

Atomic symbol of helium has He, the number 2 over He and the number 4.003 below it

Chemical Symbol

The letters that stand for an element's name

The chemical symbol of Helium is He

The chemical symbol of Helium is He

Electron

Subatomic particle with a negative charge

A proton has a positive charge, neutron no charge and electron negative.

A proton has a positive charge, neutron no charge and electron negative.

Group

Elements on the periodic table with the same number of valence electrons

Hydrogen and Lithium have the same number of valence electrons so they are in the same group.

Isotope

An atom of an element that loses or gains a neutron.

An oxygen atom loses two neutrons. It is a isotope.

An oxygen atom loses two neutrons. It is a isotope.

Mass Number

The number of neutrons plus the number of protons.

Helium has 2 protons, and 2 neutrons. It's mass number is 4

Helium has 2 protons, and 2 neutrons. It's mass number is 4

Metal

Elements that tend to lose electrons

Most of the elements are metals.

Most of the elements are metals.

Metalloid

Elements that have properties of metal and non-metals.

There are six elements on the periodic table that are metalloids

There are six elements on the periodic table that are metalloids

Neutron

Sub-atomic particle with a neutral charge

Helium has two neutrons

Helium has two neutrons

Non-Metals

Elements that tend to gain electrons

There are 18 non metals

There are 18 non metals

Nucleus

The core of an atom, containing protons and neutrons

The nucleus of an atom of helium has 2 protons and 2 neutrons 

The nucleus of an atom of helium has 2 protons and 2 neutrons

Period

Horizontal rows on the periodic table that share the same amount of electron energy levels

Aluminum and Silicon are in the same period.

Aluminum and Silicon are in the same period.

Proton

Sub-atomic particle with a positive charge

Helium has two protons

Helium has two protons

Sub-Atomic Particle

A proton, neutron or electron

Hydrogen has 3 sub-atomic particles

Hydrogen has 3 sub-atomic particles