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18 Cards in this Set
- Front
- Back
- 3rd side (hint)
Atom |
The smallest unit that defines elements and their isotopes. |
Atoms make up all elements |
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Atomic Mass |
How much mass one atom of an element has. |
One helium atom has a atomic mass of 4.003 |
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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 |
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Atomic Number |
The amount of protons in the nucleus of an atom. |
The atom number of helium is 2 |
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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 |
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Chemical Symbol |
The letters that stand for an element's name |
The chemical symbol of Helium is He |
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Electron |
Subatomic particle with a negative charge |
A proton has a positive charge, neutron no charge and electron negative. |
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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. |
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Isotope |
An atom of an element that loses or gains a neutron. |
An oxygen atom loses two neutrons. It is a isotope. |
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Mass Number |
The number of neutrons plus the number of protons. |
Helium has 2 protons, and 2 neutrons. It's mass number is 4 |
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Metal |
Elements that tend to lose electrons |
Most of the elements are metals. |
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Metalloid |
Elements that have properties of metal and non-metals. |
There are six elements on the periodic table that are metalloids |
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Neutron |
Sub-atomic particle with a neutral charge |
Helium has two neutrons |
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Non-Metals |
Elements that tend to gain electrons |
There are 18 non metals |
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Nucleus |
The core of an atom, containing protons and neutrons |
The nucleus of an atom of helium has 2 protons and 2 neutrons |
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Period |
Horizontal rows on the periodic table that share the same amount of electron energy levels |
Aluminum and Silicon are in the same period. |
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Proton |
Sub-atomic particle with a positive charge |
Helium has two protons |
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Sub-Atomic Particle |
A proton, neutron or electron |
Hydrogen has 3 sub-atomic particles |