Examples: stearic acid, hydrofluoric acid.
Nucleic acids would be one example of a covalent compound with more than 3 elements. Proteins have more than 3 elements as well. Many organic compounds do, it is quite common.
They form both. For example, the standard alkyls, alcohols, acids, amines, aminos, etc. form covalent bonds, but organometallic compounds, salts of acids and amines, and similar compounds form ionic (although still using covalent bonding for part of thir structure).
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Electrolytes: acids, bases, and salts (ionic compounds) Nonelectrolytes: usually covalent compounds with the exception of acids. Ionic compounds : One of the ions has a positive charge (called a "cation") and the other has a negative charge ("anion") *Electrolytes can be strong or weak
Organic molecules all contain covalent bonds. It is possible, though not common, to have an ionic bond as well as covalent bonds in a molecule.
For example, ionic compounds: inorganic acids, salts, bases; many organic compounds, etc.
Any atom (or ion) or compound that can accept a pair of electrons to form a covalent bond.
They are not always inorganic. For example, benzoic acid, ethanoic acid and ascorbic acid (vitamin c) are all organic compounds. However, acids and bases are generally ionic compounds when in solution. This is because the definition of an acid , as well as something with a pH of less than 7, can be "a substance that can form ions, the only positive ion present being the Hydrogen H+ ion". Similarly a base is the oxide or hydroxide of a metal (or something acting like a metal such as the ammonium ion). Bases that dissolve in water react with the water to form alkalis which have, as their only negative ions, hydroxide ions (OH-). Therefore, all acids and bases must be ionic compounds rather than covalent compounds as they need to form ions in solution. Furthermore, there are many acids that are covalent (such as the organic acids above) and only become acids when in solution. Such an example is thanoic acid which is a covalent compound: CH3COOH. This is not acidic unless it is in the presence of water, when it becomes an acid splitting into ions: CH3COOH -----------> CH3COO- + H+
Acids react -in most cases, but not exclusively- well with basic (alkaline) compounds.
For example, ionic compounds: inorganic acids, salts, bases; many organic compounds, etc.
Acids are all polar covalent to some extent. Probably the most common polar covalent compound is water, H2O. Some other examples are ammonia, NH3, boron trifluoride, BF3, and hydrogen fluoride, HF. Basically, any two atoms with a percentage of ionic character (electronegativity difference) between 5% and 50% will form polar covalent bonds.
Boron is in group 3 and forms generally 3 covalent bonds. Because forming 3 bonds only gives boron a share of 6 electrons boron compounds are Lewis acids.