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Science Chapter 16
Science
Term | Definition |
---|---|
Group # | number of electrons in outer level |
Period # | number of energy levels it has |
What’s in nucleus? | protons and neutrons |
Where is electron cloud & what’s in it | around the nucleus & empty space with electrons |
Electrons | close to nucleus & far from nucleus |
What happens as you move down periodic table | closer electron is to nucleus the stronger the force (attraction). closer electrons are harder to remove, far electrons easier to remove |
Noble gasses | called “stable” if outer shell is full |
Energy Steps | how many can 1st & 2nd levels hold? first level can hold 2, and the second can hold 8 |
Ions | An atom that is no longer neutral because it has lost or gained an electron |
Covalent Bond | The chemical bond that forms between nonmetal atoms when they share electrons. |
Ionic Bond | The attraction that holds the ions close together, is a type of chemical bond |
Chemical Formula | A combination of chemical symbols and numbers that shows which elements are present in an compound |
Molecule | the neutral partical formed when atoms share electrons |
Electron Dot Diagrams | a symbol to show how many electrons are in the outer energy level |