Block (periodic table)

A block of the periodic table of elements is a set of adjacent groups. The term appears to have been first used by Charles Janet. The respective highest-energy electrons in each element in a block belong to the same atomic orbital type. Each block is named after its characteristic orbital; thus, the blocks are:

s-block

p-block

d-block

f-block

g-block (hypothetical)

The block names (s, p, d, f and g) are derived from the spectroscopic notation for the associated atomic orbitals: sharp, principal, diffuse and fundamental, and then g which follows f in the alphabet.

The following is the order for filling the "subshell" orbitals, according to the Aufbau principle, which also gives the linear order of the "blocks" (as atomic number increases) in the periodic table:

For discussion of the nature of why the energies of the blocks naturally appear in this order in complex atoms, see atomic orbital and electron configuration.

The "periodic" nature of the filling of orbitals, as well as emergence of the s, p, d and f "blocks" is more obvious, if this order of filling is given in matrix form, with increasing principal quantum numbers starting the new rows ("periods") in the matrix. Then, each subshell (composed of the first two quantum numbers) is repeated as many times as required for each pair of electrons it may contain. The result is a compressed periodic table, with each entry representing two successive elements:

This page contains text from Wikipedia, the Free Encyclopedia - https://wn.com/Block_(periodic_table)

Latest News for: block

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The Daily Mail 18 Oct 2018

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Prosecutors sue to block misconduct commission

Times Union 18 Oct 2018

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The Seattle Times 18 Oct 2018

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Man dies after `fight´ at London block of flats

This is Money 18 Oct 2018

A man has died after being assaulted at a block of flats in south-west London ... All the suspects had fled before police arrived ... No arrests have been made ... ....

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Man dies after ‘fight’ at London block of flats

ITV 18 Oct 2018

A man has died after being assaulted at a block of flats in south-west London ... All the suspects had fled before police arrived ... No arrests have been made ... ....

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Reno roads: Zombies will block streets Saturday night

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Secret Service investigating incident in which agent blocked reporter from questioning Kushner

The Virginian-Pilot 18 Oct 2018

The Secret Service says it is investigating an incident in which an agent blocked a CBS News correspondent from questioning White House senior adviser Jared Kushner ... ....

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CBS says Secret Service agent blocked its reporter from quizzing Jared Kushner over Saudi scandal

Japan Times 18 Oct 2018

CBS News says a Secret Service agent blocked one of its correspondents from asking Jared Kushner a question when he was walking out of an ... ....

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Defence contractor tried to block parts of critical auditor-general's report

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The Auditor-General has slammed the process where a redacted report was held up for more than six months ... ....

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Mainland Chinese developers eye Hong Kong’s ageing residential blocks for redevelopment

South China Morning Post 18 Oct 2018

A wave of mainland Chinese firms have started hunting for old buildings in Hong Kong’s urban areas, in a bid to acquire cheap land for redevelopment in the world’s most expensive property market. As of October 4, there were 25 applications submitted by developers for compulsory en-bloc sale, according to data from the Lands Tribunal ... “The surge is partly driven by the... ....

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