periodic table

• anion: an ion with a net negative charge
• atomic number: the number of protons in each atom of an element
• cation: an ion with a net positive charge
• chemical bond: an attractive force that holds two atoms together
• compound: a substance made up of two or more types of atom bonded together
• covalent bond: an attraction between atoms that share electrons
• electron configuration: the arrangement of electrons in shells around an atoms nucleus
• electron shell: a grouping electrons around the nucleus of an atom
• group: a column in the periodic table
• ion: an atom or molecule with a net charge
• ionic bond: an electrostatic attraction between ions with opposite charges
• lattice: a repeating arrangement of atoms in a solid
• metal: a shiny, malleable element that conducts heat and electricity
• molecule: a group of atoms bonded together
• neutral atom: an atom with no net charge
• noble gas: an element that is non- reactive due to its full valence shell
• non-metal: a dull, brittle element that does not conduct heat or electricity
• period: a row in the periodic table
• periodic table: a grid arrangement of all known elements in order of atomic number
• reactivity: a substance's tendency to chemically interact with other substances
• valence electron: an electron in the outermost occupied shell of an atom
• valence shell: the outermost occupied shell of an atom