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Science Chapter 16


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