How many electrons does argon have

Complete answer:
We know that there are four quantum numbers, i.e., principle quantum number, Azimuthal quantum number, magnetic quantum number, and spin quantum number.
${{m}_{l}}$ is the magnetic quantum number and l is the Azimuthal quantum number. With the help of l value we can find the magnetic quantum number. Given ${{m}_{l}}$=1, the values of the magnetic quantum number will range from -1 to 1.
The value of l is 1 when the subshell is p.
The given element in the question is Argon whose atomic number is 18 so, there are 18 electrons in argon atom. Its electronic configuration is given below:
$1{{s}^{2}}2{{s}^{2}}2{{p}^{6}}3{{s}^{2}}3{{p}^{6}}$
We know that there are three orbitals in the p-subshell, which are denoted as -1, 0, and 1. In argon there are 2p and 3p orbitals. The arrangement of electrons is given below:

Hence the correct answer is an option (c)

Note:
The value of ${{m}_{l}}$= 1 will also come for d-subshell, but in argon it is not considered because in argon there is no d-subshell and no electrons into d-orbital. If the electron enters a d-subshell, then we have to count the electron in the d-subshell also.

Complete Solution :
Symbolically Argon is denoted as ‘${\text{Ar}}$’ in the periodic table and its atomic number is 18.
-As we know that the atomic number $\left( {\text{Z}} \right)$ of an atom is always equal to the number of protons present inside the nucleus or number of electrons present in the orbitals outside the nucleus.
i.e. Atomic Number = No. of protons = No. of electrons
-So, the number of electrons in the Argon atom is 18 because it is present in the neutral state.
-Electronic configuration of Argon is shown as follow:
$1{s^2},2{s^2}2{p^6},3{s^2}3{p^6}$
Hence, from the above given configuration it is clear that the number of valence electrons in the Argon atom is eight.

Additional information-
Argon is present in the VIII A group of the periodic table and it is a noble gas, which means it is chemically very less reactive in nature due to stable configuration of outermost shell; that’s why it is always present in the monatomic form. Argon is present in the gaseous state, its appearance is colorless and it is an odorless gas. Argon is the most abundant gas in the environment after Nitrogen and Oxygen.

Note: Here some of you may do wrong calculation if you only count p-orbital electrons and leave s-orbital electrons. During the calculation of valence electrons always add electrons present in the s-orbital as well as in p-orbital of the outermost shell.

The Crystal structure can be described in terms of its unit Cell. The unit Cells repeats itself in three dimensional space to form the structure.

Unit Cell Parameters

The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c)

and the angles between them Lattice Angles (alpha, beta and gamma).

The positions of the atoms inside the unit cell are described by the set of atomic positions ( xi, yi, zi) measured from a reference lattice point.

The symmetry properties of the crystal are described by the concept of space groups. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct.

Argon Atomic and Orbital Properties

Argon atoms have 18 electrons and the electronic shell structure is [2, 8, 8] with Atomic Term Symbol (Quantum Numbers) 1S0.

Bohr Atomic Model of Argon - Electrons per energy level

Ground State Electronic Configuration of Argon - neutral Argon atom

Abbreviated electronic configuration of Argon

The ground state abbreviated electronic configuration of Neutral Argon atom is [Ne] 3s2 3p6. The portion of Argon configuration that is equivalent to the noble gas of the preceding period, is abbreviated as [Ne]. For atoms with many electrons, this notation can become lengthy and so an abbreviated notation is used. This is important as it is the Valence electrons 3s2 3p6, electrons in the outermost shell that determine the chemical properties of the element.

Unabbreviated electronic configuration of neutral Argon

Complete ground state electronic configuration for the Argon atom, Unabbreviated electronic configuration

1s2 2s2 2p6 3s2 3p6

Electrons are filled in atomic orbitals as per the order determined by the Aufbau principle, Pauli Exclusion Principle and Hund’s Rule.

Atomic Structure of Argon

Argon atomic radius is 71 pm, while it's covalent radius is 97 pm.

Atomic Spectrum of Argon

Argon Chemical Properties: Argon Ionization Energies and electron affinity

The electron affinity of Argon is 0 kJ/mol.

Ionization Energy of Argon

Refer to table below for Ionization energies of Argon

Argon Physical Properties

Refer to below table for Argon Physical Properties

Elastic Properties

Hardness of Argon - Tests to Measure of Hardness of Element

Argon Electrical Properties

Argon is Conductor of electricity. Refer to table below for the Electrical properties ofArgon

Argon Heat and Conduction Properties

Argon Magnetic Properties

Optical Properties of Argon

Acoustic Properties of Argon

Argon Thermal Properties - Enthalpies and thermodynamics

Refer to table below for Thermal properties of Argon

Enthalpies of Argon

Argon Isotopes - Nuclear Properties of Argon

Argon has 24 isotopes, with between 30 and 53 nucleons. Argon has 3 stable naturally occuring isotopes.

Isotopes of Argon - Naturally occurring stable Isotopes: 36Ar, 38Ar, 40Ar.

IsotopeZNIsotope Mass% AbundanceT halfDecay Mode30Ar181230Synthetic31Ar181331Synthetic32Ar181432Synthetic33Ar181533Synthetic34Ar181634Synthetic35Ar181735Synthetic36Ar1818360.3365%StableN/A37Ar181937Synthetic38Ar1820380.0632%StableN/A39Ar182139Synthetic40Ar18224099.6003%Stable41Ar182341Synthetic42Ar182442Synthetic43Ar182543Synthetic44Ar182644Synthetic45Ar182745Synthetic46Ar182846Synthetic47Ar182947Synthetic48Ar183048Synthetic49Ar183149Synthetic50Ar183250Synthetic51Ar183351Synthetic52Ar183452Synthetic53Ar183553Synthetic

How many electrons do argon have?

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