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Science Unit test 1
>:)
Prompt | Answer |
---|---|
What are compounds | Pure substances with 1 or more elements chemically combined. |
What is a molecule | a structure made of two or more atoms |
What is a valence electron | Electrons on the outermost shell of an atom |
What are the elements arranged by | increasing Atomic number |
Elements in the same group/family (columns) are arranged by | the same number of valence electrons and also reactivity |
Where are the least reactive metals | the middle |
Elements within a group have: | similiar properties |
The first group of the elements is solid at room temperature: true/false | True |