Number of Electrons - What are Electrons?
Electrons are tiny, very light particles that have a negative electrical charge. Electrons are negatively charged, circling the nucleus, making it a neutral, orbital particle. Protons are much larger and heavier than electrons and have a positive charge. Electrons are positively charged and located in the nucleus together with the neutrons. Electrons have a charge of +1 and a mass of approximately 1 atomic mass unit (amu).

Number of Electrons - How to find the Atomic Number of an element
Every element has a unique Element Symbol and a unique Atomic Number which can be accessed via the Periodic Table with Atomic Mass. You can also refer to the bottom of this page to an at-a-glance chart of all the elements and their atomic number in numerical order.

 

 

Protons, Electrons and Neutrons

ParticleChargeLocation
Proton+1Nucleus of Atom
Electron-1Orbital
Neutron0Nucleus of Atom

Atoms must have equal numbers of protons and electrons

 

The Atomic number = The Number of Protons in the atom of an element
Atoms must have equal numbers of protons and electrons

Number of Electrons

Number of Electrons - How to find the Number of Electrons - Examples
The atomic number is based on the number of Protons in the atom of an element. (Note: Atoms must also have equal numbers of Electrons & Protons.) So, if we know the atomic number of an element then we also know how many Protons are in an element and therefore the number of electrons in an element.

  • Example 1 - Number of Protons in Gold: The element Gold (Symbol Au) has the Atomic Number of 79. Any atom that contains exactly 79 protons in its nucleus is an atom of gold. The number of protons in atom of gold is therefore 79. And as there must be an equal number of electrons and protons in an element there must also be 79 Electrons in the element.

  • Example 2 - Number of Protons in Silver: The element Silver (Symbol Ag) has the Atomic Number of 47. Any atom that contains exactly 47 protons in its nucleus is an atom of silver. The number of protons in atom of silver is therefore 47. And as there must be an equal number of electrons and protons in an element there must also be 47 Electrons in the element.

  • Example 3 - Number of Protons in Neon: The element Neon (Symbol Ne) has the Atomic Number of 10. Any atom that contains exactly 10 protons in its nucleus is an atom of gold. The number of protons in atom of gold is therefore 10. And as there must be an equal number of electrons and protons in an element there must also be 10 Electrons in the element.

Refer to the table below and work out the number of Electrons in various elements.

Number of Electrons - How to find the Number of Electrons
Calculating the number of Electrons in an atom or element by using the atomic number and number of protons information.

Name of Element Symbol of ElementAtomic NumberNumber of ProtonsNumber of Electrons
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulfur
Chlorine
Argon
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
Cesium
Barium
Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
Francium
Radium
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Darmstadtium
Roentgenium
Ununbium
Ununtrium
Ununquadium
Ununpentium
Ununhexium
Ununseptium
Ununoctium
H
He
Li
Be
B
C
N
O
F
Ne
Na
Mg
Al
Si
P
S
Cl
Ar
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
Rb
Sr
Y
Zr
Nb
Mo
Tc
Ru
Rh
Pd
Ag
Cd
In
Sn
Sb
Te
I
Xe
Cs
Ba
La
Ce
Pr
Nd
Pm
Sm
Eu
Gd
Tb
Dy
Ho
Er
Tm
Yb
Lu
Hf
Ta
W
Re
Os
Ir
Pt
Au
Hg
Tl
Pb
Bi
Po
At
Rn
Fr
Ra
Ac
Th
Pa
U
Np
Pu
Am
Cm
Bk
Cf
Es
Fm
Md
No
Lr
Rf
Db
Sg
Bh
Hs
Mt
Ds
Rg
Uub
Uut
Uuq
Uup
Uuh
Uus
Uuo
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113
114
115
116
117
118
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Name of Element (Alphabetical list)Symbol of ElementAtomic NumberNumber of Protons
 
Number of Electrons

Numbers of Electrons
 

 

Number of Electrons

Number of Electrons and the Periodic Table - the most important chemistry reference there is, and
the cornerstone of science since 1869


 

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