Se Periodic Table

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term 'mass' is more accurate.)

For instance, it can be determined experimentally that neon consists of three isotopes: neon-20 (with 10 protons and 10 neutrons in its nucleus) with a mass of 19.992 amu and an abundance of 90.48%, neon-21 (with 10 protons and 11 neutrons) with a mass of 20.994 amu and an abundance of 0.27%, and neon-22 (with 10 protons and 12 neutrons) with a mass of 21.991 amu and an abundance of 9.25%. The average atomic mass of neon is thus:

Se 34 S 16 O 8 Tm 69 Md 101 (258) Erbium 167.26 Fermium 15 Bi 83 Sb 51 As 33 P 15 N 7 Er 68 Fm 100 (257) Holmium 164.930 Einsteinium 14 Pb 82 Sn 50 Ge 32 Si 14 C 6 Ho 67 Es 99 (252) Dysprosium 162.50 Californium 13 Tl 81 In 49 Ga 31 Al 13 B 5 Dy 66 Cf 98 (251) Terbium 158.925 Berkelium 12 Hg 80 Cd 48 Zn 30 Tb 65 Bk 97. Periodic Table of the. Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure.

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0.9048×19.992 amu=18.09 amu
0.0027×20.994 amu= 0.057 amu
0.0925×21.991 amu= 2.03 amu
20.18 amu

The atomic mass is useful in chemistry when it is paired with the mole concept: the atomic mass of an element, measured in amu, is the same as the mass in grams of one mole of an element. Thus, since the atomic mass of iron is 55.847 amu, one mole of iron atoms would weigh 55.847 grams. The same concept can be extended to ionic compounds and molecules. One formula unit of sodium chloride (NaCl) would weigh 58.44 amu (22.98977 amu for Na + 35.453 amu for Cl), so a mole of sodium chloride would weigh 58.44 grams. One molecule of water (H2O) would weigh 18.02 amu (2×1.00797 amu for H + 15.9994 amu for O), and a mole of water molecules would weigh 18.02 grams.

Table

The original periodic table of the elements published by Dimitri Mendeleev in 1869 arranged the elements that were known at the time in order of increasing atomic weight, since this was prior to the discovery of the nucleus and the interior structure of the atom. The modern periodic table is arranged in order of increasing atomic number instead.

The periodic table is an arrangment of the chemical elements ordered by atomic number so that periodic properties of the elements (chemical periodicity) are made clear.

Se Periodic Table Element

Explore the chemical elements through this periodic table

Se In Periodic Table

Group123456789101112131415161718
Period
1
Hydrogen
Helium
2
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
3
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulfur
Chlorine
Argon
4
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
5
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Tc
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
6
Caesium
Barium
*
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury
Thallium
Lead
Bismuth
Po
Polonium
At
Astatine
Rn
Radon
7
Fr
Francium
Ra
Radium
**
Lr
Lawrencium
Rf
Rutherfordium
Db
Dubnium
Sg
Seaborgium
Bh
Bohrium
Hs
Hassium
Mt
Meitnerium
Ds
Darmstadtium
Rg
Roentgenium
Cn
Copernicium
Nh
Nihonium
Fl
Flerovium
Mc
Moscovium
Lv
Livermorium
Ts
Tennessine
Og
Oganesson
*Lanthanoids*
Lanthanum
Cerium
Praseodymium
Neodymium
Pm
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
**Actinoids**
Ac
Actinium
Th
Thorium
Pa
Protactinium
U
Uranium
Np
Neptunium
Pu
Plutonium
Am
Americium
Cm
Curium
Bk
Berkelium
Cf
Californium
Es
Einsteinium
Fm
Fermium
Md
Mendelevium
No
Nobelium

The standard form of the periodic table shown here includes periods (shown horizontally) and groups (shown vertically). The properties of elements in groups are similar in some respects to each other.

There is no one single or best structure for the periodic table but by whatever consensus there is, the form used here is very useful and the most common. The periodic table is a masterpiece of organised chemical information and the evolution of chemistry's periodic table into the current form is an astonishing achievement.