In physics and chemistry, monatomic is a combination of the words "mono" and "atomic," and means "single atom." It is usually applied to gases: a monatomic gas is one in which atoms are not bound to each other. At standard temperature and pressure (STP), all of the noble gases are monatomic. These are helium, neon, argon, krypton, xenon and radon. The heavier noble gases can form compounds, but the lighter ones are unreactive. All elements will be monatomic in the gas phase at sufficiently high temperatures. The only mode of motion of a monatomic gas is translation (electronic excitation is not important at room temperature). Thus in an adiabatic process, monatomic gases have an idealised γ-factor (Cp/Cv) of 5/3, as opposed to 7/5 for ideal diatomic gases where rotation (but not vibration at room temperature) also contributes. Also, for ideal monatomic gases: : the molar heat capacity at constant pressure (Cp) is 2.5 R = 20.8 J K-1 mol-1 (4.97 cal K-1 mol-1); : the molar heat capacity at constant volume (Cv) is 1.5 R= 12.5 J K-1 mol-1 (2.98 cal K-1 mol-1); where R is the gas constant.
All chemical elements will be monatomic in the gas phase at sufficiently high temperatures. Noble gases are the only chemical elements which are stable single atom molecules at standard temperature and pressure.
it is when each molecule has 2 atoms in it.
Polyatomic ionic.
monatomic
monatomic
Sodium sulfate is an ionic compound, composed of monatomic and monovalent sodium cations and polyatomic and divalent sulfate anions. The anions are internally covalently bonded, but are not compounds because they are not electrically neutral.
If it is a monatomic ion, the ending of its name is changed to -ide. For example, the anion formed by an oxygen atom is called oxide, and the anion formed by the chlorine atom is called chloride.
Sulfur hexafluoride is not a monatomic ion but in fact a molecular compound.
Because it has to have more than one atom to be a compound.
Polyatomic ionic.
monatomic
Nitrate
nitrate
Ammonium, NH4+
monatomic
Monatomic means having 1 atom.
'Monatomic' means having or consisting of single atoms.
Yes. All the noble gasses are monatomic.
Sodium sulfate is an ionic compound, composed of monatomic and monovalent sodium cations and polyatomic and divalent sulfate anions. The anions are internally covalently bonded, but are not compounds because they are not electrically neutral.