Any of the chemical elements in the second row of the periodic table
Period 2 in the periodic table
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
Caesium
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 (element)
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
Copernicium
Nihonium
Flerovium
Moscovium
Livermorium
Tennessine
Oganesson
Part of a series on the
Periodic table
Periodic table forms
18-column
32-column
Alternativeandextendedforms
Periodic table history
D. Mendeleev
1871 table
1869 predictions
Discovery of elements
Naming and etymology
for people
for places
controversies
(in East Asia)
Systematic element names
Sets of elements
By periodic table structure
Groups (1–18)
1 (alkali metals)
2 (alkaline earth metals)
3
4
5
6
7
8
9
10
11
12
13
14
15 (pnictogens)
16 (chalcogens)
17 (halogens)
18 (noble gases)
Periods (1–7, ...)
1
2
3
4
5
6
7
8+
Blocks (s, p, d, f, ...)
Atomic orbitals
Aufbau principle
By metallic classification
Metals
alkali
alkaline earth
transition
post-transition
lanthanide
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unclassified
nonmetal halogen
noble gas
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Elements
List of chemical elements
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Properties of elements
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Electrical resistivity
Electron affinity / configuration
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Heat capacity / of fusion / of vaporization
Ionization energy
Melting point
Oxidation state
Speed of sound
Thermal conductivity / expansion coefficient
Vapor pressure
Category
Chemistry Portal
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A period 2 element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements. The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases; a new row is started when chemical behavior begins to repeat, creating columns of elements with similar properties.
The second period contains the elements lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. In a quantum mechanical description of atomic structure, this period corresponds to the filling of the second (n = 2) shell, more specifically its 2s and 2p subshells. Period 2 elements (carbon, nitrogen, oxygen, fluorine and neon) obey the octet rule in that they need eight electrons to complete their valence shell (lithium and beryllium obey duet rule, boron is electron deficient.), where at most eight electrons can be accommodated: two in the 2s orbital and six in the 2p subshell.
Period2 in the periodic table A period2element is one of the chemical elements in the second row (or period) of the periodic table of the chemical elements...
Period 3 in the periodic table A period 3 element is one of the chemical elements in the third row (or period) of the periodic table of the chemical elements...
Period 4 in the periodic table A period 4 element is one of the chemical elements in the fourth row (or period) of the periodic table of the chemical elements...
Period 5 in the periodic table A period 5 element is one of the chemical elements in the fifth row (or period) of the periodic table of the chemical elements...
Period 7 in the periodic table A period 7 element is one of the chemical elements in the seventh row (or period) of the periodic table of the chemical...
Extended periodic table Element 119 (Uue, marked here) in period 8 (row 8) marks the start of theorisations. An extended periodic table theorizes about...
Period 1 in the periodic table A period 1 element is one of the chemical elements in the first row (or period) of the periodic table of the chemical elements...
Period 6 in the periodic table A period 6 element is one of the chemical elements in the sixth row (or period) of the periodic table of the chemical elements...
1926 (before the 1932 discovery of the neutron) for the hypothetical "element of atomic number zero" (with zero protons in its nucleus) that he placed...
It is found that the chemistry of a period2element often has similarities to the chemistry of the period 3 element one column to the right of it in the...
elements, it is expected to be an s-block element, an alkaline earth metal, and the second element in the eighth period. It has attracted attention because...
antimony, and bismuth. Although each period2element from lithium to oxygen shows some similarities to the period 3 element in the next group (from magnesium...
The Fifth Element is a 1997 English-language French science fiction action film conceived and directed by Luc Besson, as well as co-written by Besson...
A chemical element is a chemical substance that cannot be broken down into other substances by chemical reactions. The basic particle that constitutes...
expected to be an s-block element, an alkali metal, and the first element in the eighth period. It is the lightest element that has not yet been synthesized...
An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment...
formed the two worlds (mbûngi), and the path of the sun. Each element correlates to a period in the life cycle, which the Bakongo people also equate to the...
periodic table of the elements it is a p-block element, a member of group 18 and the last member of period 7. Its only known isotope, oganesson-294, is...
extended periodic table with an additional period of 50 elements (thus reaching element 168); this eighth period was derived from an extrapolation of the...
order. Silver is also the most thermally conductive element, and the most light reflecting element. Silver also has the unusual property that the tarnish...
signification. Also given is each element's atomic number, atomic weight, or the atomic mass of the most stable isotope, group and period numbers on the periodic...
defining characteristic whereby each component element has 5 electrons in their valence shell, that is, 2 electrons in the s sub-shell and 3 unpaired electrons...
the 978 prefix element. The single-digit registration groups within the 978-prefix element are: 0 or 1 for English-speaking countries; 2 for French-speaking...
thorium and not as a primordial element. There have been experiments, all unsuccessful, to try to synthesize element 120, the next potential member of...
stellar fusion. Germanium makes up 2 parts per million of the Earth's crust, making it the 52nd most abundant element there. On average, germanium makes...
in the same period tend to have similar properties, as well. Thus, it is relatively easy to predict the chemical properties of an element if one knows...
joint-highest atomic mass of all known elements, and is the penultimate element of the 7th period of the periodic table. The discovery of tennessine was officially...
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