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Organizing Elements
8th Grade Organizing Elements
Question | Answer |
---|---|
What did Dmitri Mendeleev discover in 1869? | A set of patterns in the properties of elements. |
What is the atomic mass of an element? | the average mass of all isotopes in an element |
Mendeleeve noticed that patterns appeared when he arranged the elements in what way? | In order of increasing atomic mass |
Mendeleev's periodic table had ... blank spaces left in it, which repersented elements that had not yet been discovered. | 3 |
What does the word periodic mean? | A regular repeated pattern |
A chart of the elements showing the repeating pattern of their properties is called the ... | Periodic table |
A one or two letter representation of an element is called a ... | chemical symbol |
How can an elements properties be predicted? | From the location in the peroidic table |
Each horizontal row in the table is called a ... | period |
Group 15 of the periodic table is the ... family. | Nitrogen |