5162010
Description
Flashcards by husien jama, updated more than 1 year ago
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Created by husien jama
over 9 years ago
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| Question | Answer |
| what is an atom? | the fundamental building blocks of all things. |
| what is an atomic number? | the number of protons in a nucleus. |
| what is a compound? | a pure substance made up of two or more different types of atoms. |
| what is used to look at an atom? | STM |
| how many known atoms are there? | 118 atoms. |
| how many atoms are naturally found on Earth? | 91 are naturally found on Earth. |
| how many atoms are made in a laboratory? | 27. |
| what is a molecule? | a cluster of atoms. |
| what is an element? | a substance made of just one atom. |
| what is the nucleus? | protons and neutrons sitting in the center of an atom. |
| what are atoms made up of? | Nucleus , Electron cloud ,protons ,neurons. |
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