Examples of monatomic in the following topics:
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- Noble gases are the six chemical elements of Group 18 of the periodic table, being monatomic and (with very limited exceptions) inert.
- These gases all have similar properties under standard conditions: they are all odorless, colorless, monatomic gases with very low chemical reactivity.
- In the case of Neon (Ne), for example, both the n = 1 and n = 2 shells are complete and therefore it is a stable monatomic gas under ambient conditions.
- They are all monatomic gases under standard conditions, including those with larger atomic masses than many other elements that are solids under standard conditions.
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- Ultraviolet light can split nitrogen dioxide into nitric oxide and monatomic oxygen; this monatomic oxygen can then react with oxygen gas to form ozone.
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- Ultraviolet light splits oxygen gas (O2) to form monatomic oxygen (O) that can react with additional oxygen gas molecules to form ozone (O3).
- The ozone produced can then go on to react with monatomic oxygen and re-form oxygen gas.
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- Monatomic ions are formed by the addition or removal of electrons from an atom's valence shell.
- The two notations are therefore exchangeable for monatomic ions, but the Roman numerals cannot be applied to polyatomic ions.
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- The component ions in a salt can be inorganic; examples include chloride (Cl−), the organic acetate (CH3COO−), and monatomic fluoride (F−), as well as polyatomic ions such as sulfate (SO42−).
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- The group VIII elements
(helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn)) exist as monatomic gases at standard temperature and pressure (STP) and are called the noble gases.
- These gases, when grouped together with the monatomic noble gases are called "elemental gases. "
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- When creating ionic compounds with these polyatomic ions, treat them the same way as typical monatomic ions (only one atom).