Formed between two non-metals Valence electrons are shared between atoms
Contain just two different types of non-metal elements
Covalent compound have a few rules to naming to those of ionic compound When non-metals combine they can form several different covalent compounds Example: Carbon and oxygen combine to form two common covalent compounds CO 2 and CO Each of these compounds have their own names
1. Always write/name the element with more metallic character first. Metallic character increases going from right to left, and top to bottom on the Periodic Table.
2. Then write/name the second (less metallic) element, changing the ending of its name to –”ide”
3. Since nonmetals often combine in different proportions to form a number of different compounds, prefixes must be included in the names to indicate the numbers of each kind of atom present.
The mono- prefix is usually not used for the first element in the formula. Example: BCl 3 boron trichloride
Never use any prefixes at all for simple covalent compounds containing Hydrogen Example: HF hydrogen fluoride
The "o" and "a" endings of these prefixes are dropped when they are attached to "oxide." Example: N 2 O 5 dinitrogen pentoxide
Generally, they are in the same left-to-right order that they have on the periodic table, except that you would have to squeeze hydrogen in between nitrogen and oxygen. Examples: NH3 ammonia CH4 methane H2O water
Element that consists of two atoms combined Examples: F 2 fluorine N 2 nitrogen