| A | B |
|---|
| what attractions hold atoms together in a covalent bond? | The attractions between the shared electrons and the protons in each nucleus hold the atoms together |
| a molecule is | a neutral group of atoms that are joined together by one or more covalent bonds |
| a covalent bond is | a chemical bond in which two atoms share a pair of valence electrons |
| diatomic | means two atoms |
| a covalent bond in which electrons are not shared equally is called a | polar covalent bond |
| when atoms for a polar covalent bond, the atom with the greater attraction for electrons has a partial negative charge. What about the other atom? | Has a partial positive charge. |
| The type of atoms in a molecule and its shape are factors... | that determine whether a molecule is polar or non polar |
| attractions between polar molecules are | stronger than attractions between nonpolar molecules |
| single bonds | share 1 pair of electrons |
| double bonds | 2 atoms share 2 pairs of electron |
| triple bonds | 2 atoms share 3 pairs of electrons |
| 2 non metals share electrons | to become chemically stable |
| the name of an ionic compound | must distinguish the compound form from other ionic compounds cotaining the same elecments. |
| the formula for an ionic compound describes | the ratio of the ions in the compound |
| a covalently bonded group of atoms that has a positive or negative charge and acts as a unit is a | polyatomic ion |
| the name and formula of a molecular compound | describes the type and number of atoms in a molecule of the compound |
| when the highest occupied energy level of an atom is filled with electrons | the atom is stable and not likely to react |
| an electron dot diagram is a | model of an atom in which each dot represents a valence electron |
| some elements achieve stable electron | configurations through the transfer of electrons between atoms |
| an ion with a positive charge is a | cation |
| a chemical bond is the force | that holds atoms or ions together as a unit |
| an ionic bond is the force | that holds cations and anions together |
| a chemical formula | is a notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound |
| the strong properties of an ionic compound can be explained by the | strong attractions among ions within a crystal lattice |
| the mobility of electrons within a metal | lattice explains some of the properties ofmetals |
| the cations in a metal form a lattice | that is held in place by strong metallic bonds between the cations and the surrounding valance electrons |
| scientists can design alloys with specific | properties by varying the types and amounts of elements in an alloy |
