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Elements, Atoms, & the Periodic Table

Chemistry- Chemistry- The study of the properties of matter and how matter changes
Atom- Atom- The smallest unit of matter.
Element- Element- A pure substance that cannot be broken down into any other substances by Chemical or physical means (simplest substances)
Compound Compound- A pure substance made of two or more elements chemically combined in a set ratio.
Periodic table- Periodic table- A chart of the elements showing the repeating
Period- Period- The horizontal rows in the periodic table.
Group- Group- The 18 vertical columns in the periodic table.
Valence electron Valence electron- The measurement of the amount of matter in the object.
Energy level- Energy level- The location of electrons.
Atomic mass- The number of neutrons + protons in an atom. Ionic bond- A chemical bond formed between a metal and non-metal.
Density The ratio of the mass of a substance to its volume.
Mass The amount of matter in the object.
Volume- The amount of space that matter occupies. Volume- The amount of space that matter occupies.
What is the formula for density? Density = Mass รท Volume
How many groups are on the periodic table? 18
How many periods are on the periodic table? 7
Who is credited with organizing the first PT? Dmitri Mendeleev
How do you find the number of neutrons in an atom? mass - protons
What does the group # tell you about an element? They tell you how many valence electrons will be on the outer shell.
What does the period # tell you about an element? They tell you how many shells you will have.
Positive ions are called cation. They will lose electrons.
Negative ions are called anion. They will gain electrons.
Created by: hohara23