Atomic Number Of Neon

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What is the atomic number of neon?

Definition of Neon What is the definition of Neon? Neon is a colorless, odorless, and tasteless gas. Although neon gas is colorless it glows reddish orange in an electric discharge. Neon is the second-lightest noble gas, after Helium. In terms of occurrence Neon is a rare gas present in the atmosphere to an extremely limited extent. Neon is a chemical element with a chemical symbol Ne and atomic number 10. It is a noble gas that is colorless, odorless, inert and monatomic. It is the fifth most abundant chemical element in the universe by mass but a rare element on Earth. Neon Properties: The melting point of neon is -248.67°C, boiling point is -246.048°C (1 atm), density of gas is 0.89990 g/l (1 atm, 0°C), density of liquid at b.p. Is 1.207 g/cm 3, and valence is 0. Neon is very inert, but it does form some compounds, such as with fluorine.

3 Answers


The atomic number is the number of protons in the nucleus, so the atomic number is #10# (i.e. an atom of neon, #'Ne'#).

The mass number is the total number of nucleons, which is the number of protons plus the number of neutrons.

We're not given how many neutrons are in the atom, so we can't necessarily know this..

Additionally, if we wanted to figure out the ionic charge of this atom, we subtract the number of electrons from the number of protons:

#'ionic charge' = 10-12 = ul(-2#


#Z#, #'the atomic number'#, specifies the number of protons, positively charged, massive particles, present in in the element's nucleus. #Z# specifies the identity of the atom. If #Z=10#, we gots the element #'neon'#.

The NEUTRAL element contains precisely the same number of negatively charged extra-nuclear particles, that are conceived to whizz about the nuclear core; and of course these are the #'electrons'#. And thus we have a very unusual ion here, because there are more electrons than protons, and the atomic particle therefore has an associated electric charge, i.e. here we gots #Ne^(2-)#, or #'^20Ne^(2-)# to specify a likely individual isotope.

Atomic mass depends on the number of nucular particles, the aforementioned protons, but also #'neutrons'#, massive nuclear particles of ZERO electric charge, that also comprise the nucleus. Interactions between protons and neutrons, at impossibly short nuclear ranges, are strong enuff to overcome electrostatic repulsion between like charges, and bind the nucleus together. This is something you won't learn about in a chemistry class. For #'^20Ne# we have assumed that the nucleus contains 10 neutrons; were 11 neutrons present, we would have #'^21Ne#.

Historically, the electrons were assigned a negative electric charge. It would have been so much more convenient, had electrons been assigned a POSITIVE charge, and thus protons would have therefore been assigned a NEGATIVE charge. It would have saved generations of quantum chemists from getting the right magnitude but wrong sign in their answer, just because they counted odd instead of even or vice versa in their calculations on many electron systems. Of course, the particle physicists would complain, but they are weird enuff, and few enuff in number to deal with the change. C'est la vie.

See here for some practical examples.


The atomic number of an element is equal to the number of protons in its nucleus. So here it is #10#.

If the #12# is the number of electrons, then the particle is not electrically neutral (it has more electrons than protons i.e. it is an anion), and what's more its mass number cannot be calculated (we do not know the number of neutrons in the nucleus)

If the number #12# is the number of neutrons then both numbers can be calculated:

Atomic number is #10#

Mass number is #10+12=22#

The atom could be described as:

#'_10^22Ne# ##

Related questions

Element Neon - Ne

Comprehensive data on the chemical element Neon is provided on this page; including scores of properties, element names in many languages, most known nuclides of Neon. Common chemical compounds are also provided for many elements. In addition technical terms are linked to their definitions and the menu contains links to related articles that are a great aid in one's studies.

Atomic Number Of Neon

Neon Menu

  • Neon Page One
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Overview of Neon

  • Atomic Number: 10
  • Group: 18
  • Period: 2
  • Series: Noble Gasses

Neon's Name in Other Languages

  • Latin: Neon
  • Czech: Neon
  • Croatian: Neon
  • French: Neon
  • German: Neon - r
  • Italian: Neo
  • Norwegian: Neon
  • Portuguese: Neônio
  • Russian: Неон
  • Spanish: Neón
  • Swedish: Neon

Atomic Structure of Neon

  • Atomic Radius: 0.51Å
  • Atomic Volume: 16.7cm3/mol
  • Covalent Radius: 0.71Å
  • Cross Section (Thermal Neutron Capture) σa/barns: 0.04
  • Crystal Structure: Cubic face centered
  • Electron Configuration:
    1s2 2s2p6
  • Electrons per Energy Level: 2,8
    Shell Model
  • Ionic Radius:
  • Filling Orbital: 2p6
  • Number of Electrons (with no charge): 10
  • Number of Neutrons (most common/stable nuclide): 10
  • Number of Protons: 10
  • Oxidation States: 0
  • Valence Electrons: 2s2p6
    Electron Dot Model

Chemical Properties of Neon

  • Electrochemical Equivalent:
  • Electron Work Function:
  • Electronegativity: N/A (Pauling); 4.84 (Allrod Rochow)
  • Heat of Fusion: 0.3317kJ/mol
  • Incompatibilities:
  • Ionization Potential
    • First: 21.564
    • Second: 40.962
    • Third: 63.45
  • Valence Electron Potential (-eV):

Physical Properties of Neon

  • Atomic Mass Average: 20.1797
  • Boiling Point: 27.246K -245.904°C -410.6°F
  • Coefficient of lineal thermal expansion/K-1: N/A
  • Conductivity
    Thermal: 0.000493 W/cmK
  • Density: 0.9g/L @ 273K & 1atm
  • Description:
    Colorless, odorless, tasteless noble gas.
  • Enthalpy of Fusion: 0.33 kJ/mole
  • Enthalpy of Vaporization: 1.71 kJ/mole
  • Flammablity Class:
  • Freezing Point:see melting point
  • Heat of Vaporization: 1.7326kJ/mol
  • Melting Point: 24.703K -248.447°C -415.205°F
  • Molar Volume: 16.8 cm3/mole
  • Optical Refractive Index: 1.000067
  • Physical State (at 20°C & 1atm): Gas
  • Specific Heat: 0.904J/gK

Regulatory / Health

  • CAS Number
    • 7440-01-9
  • OSHAPermissible Exposure Limit (PEL)
    • No limits set by OSHA
  • OSHA PEL Vacated 1989
    • No limits set by OSHA
  • NIOSHRecommended Exposure Limit (REL)
    • No limits set by NIOSH
  • Levels In Humans:
    Note: this data represents naturally occuring levels of elements in the typical human, it DOES NOT represent recommended daily allowances.
    • Blood/mg dm-3: trace
    • Bone/p.p.m: nil
    • Liver/p.p.m: nil
    • Muscle/p.p.m: nil
    • Daily Dietary Intake: n/a
    • Total Mass In Avg. 70kg human: n/a
  • Discovery Year: 1898
  • Name Origin:
    Greek: neos (new).
  • Abundance of Neon:
    • Earth's Crust/p.p.m.: 0.00007
    • Seawater/p.p.m.: 0.0002
    • Atmosphere/p.p.m.: 18
    • Sun (Relative to H=1E12): 3.72E+07
  • Sources of Neon:
    It can be prepared by liquification of air and separated from other elements by fractional distillation. Annual world production is around 1 ton.
  • Uses of Neon:
    In a vacuum tube, neon glows reddish orange, thus, the invention of the neon lights. Neon has also been used to make lightening arrestors, voltage detectors and TV tubes.
  • Additional Notes:
    While it is inert, there have been reports of it combining with fluorine. Neon may also form ions in combination with other noble gases (NeAr, HeNe, Ne2 and with hydrogen (NeH). It also forms an unstable hydrate, so it is not nearly as inert as one might think.

Neon Menu

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Atomic Number Of Neon


A list of reference sources used to compile the data provided on our periodic table of elements can be found on the main periodic table page.

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    This database focuses on the most common chemical compounds used in the home and industry.

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Atomic Number Of 10 Neon

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