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Periodic Table

Atomic Number The number of protons in the nucleus. Protons = Electrons
Electron Negatively charged subatomic particle. Found outside of the nucleus. 1/2000 the mass of a proton or neutron.
Proton Positively charged subatomic particle found in the nucleus.
Neutron Subatomic particle with no charge found in the nucleus.
Period Horizontal row of the elements. It also stands for the number of electron shells around the element. Example Carbon is in period 2 so it has 2 electron shells.
Group/ Family Vertical column of elements with similar but not identical properties. Same number of valence electrons.
Valence Electrons Electrons in the outer shell. This is where bonds are formed with other elements.
Atomic mass Average mass of protons and neutrons in the nucleus. To find the average number of neutrons in an element subtract the atomic number from the atomic mass.
Mass Number The sum of protons and neutrons in the nucleus. This is the exact number for an isotope. To find the number of neutrons in an element subtract the atomic number from the mass number. Use this whenever available.If not available, then use the atomic mass.
Atomic Mass Unit (AMU) Unit used to measure subatomic particles.
Isotope Atom of the same element that have the same number of protons, but different numbers of neutrons.
Alkali This family reacts violently with water.
Mercury This element is liquid at room temperature and found in the transitional metals.
Nitrogen This family has 5 valence electrons
Halogen This family has two elements that are gases at room temperature.
Thorium This element has 90 electrons.
Noble Gases This family is unreactive and inert.
Boron This family has all metals, except one.
Transitional Metals This family is good conductors of heat and electricity.
Aluminum This element is the only one along the zigzag line that is not a metalloid.
Carbon This element has its own branch of science called organic chemistry.
Krypton This elementl has 8 valence electrons
Strontium This element has 5 electron shells.
Selenium This element has 45 neutrons.
Malleable Can be hammered into thin sheets
Luster Another word for shininess
Ductile Drawn into thin wires
Metals These have 1,2,3, or 4 valence electrons
Nonmetals These have 5,6,7,or 8 valence electrons
Magnesium This element has an atomic number of 12
Copper This element has an atomic mass of 64
Gold Symbol Au stands for what element?
Created by: tthomps