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science
Elements, Atoms, & the Periodic Table
Question | Answer |
---|---|
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. |