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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:
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:
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, ...
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:
Selling a brand new build. Just did a function test yesterday and everything was perfect. Selling off a Colt and KAC M4 FDE build. Build consist of the following
Colt 14.5 Gov barrel
KAC m4 RAS
Colt Gas tube
Colt Front sight post
Surefire closed tine flash hider
I have 1 (AR-10) and 3 (AR-15) armorers blocks.
ERGO Armorers Block is one of the most useful maintenance accessories available for an AR-10/AR-15. Simply bolt or clamp securely to a bench or other work surface, place an AR rifle onto the block inside the magazine well and the rifle is held in...
Colt SOCOM 14.5” barrel
KAC RAS rail with rail panel kit and vertical grip
Forged Rainer upper
Colt A4 carry handle
Pinned and welded A2X
Upper has 1000 or so rounds through it, very good condition
I got the carry handle separately and it has a few more scuffs
Ladies and Gents,
Wish I didn’t have to sell this, but alas the times are what they are. Looking to sell my Block II build. Would like to keep everything together, if possible. Will include a couple of mags (either PMAG or USGI, your choice) as well. This is ready to take to the range and...
near new LMT block 2 style upper
comes complete with a troy folding rear sight, daniel defense over the sight rail, BCG and CH
front folding grip.
conpelte ready to run upper assembly only
lower reciever that is pictured can be included for more dollars....
this is like $600 off the...
For sale is a 14.5 1:8 twist mid length Faxon Firearms pencil barrel which has been pinned and welded from the factory with a three prong flash hider to bring it up to the legal 16" requirement. It is nitrided for durability and only weighs 19.6 ounces. I'm also including a Faxon...
Colt Block 1/1.5 complete upper.
Gov M4 profile 14.5 1/7 barrel with p/w SF4P
Colt M4 upper receiver with raised 'C'
Colt complete like new BCG
CQD front sling mount
KAC RAS with various rails
M952v with offset mount (will include a tape switch, not pictured, one of the screws is...
I've got 50....maybe 60 AK mags to part with. All eastern block imported in the 90s. Pics of the AKs, the magazines in them are from that lot of mags.
$15 each. 10 for $125. FTF in Kitsap county or shipping on your dime.....USPS flat rate
All sold or SPF
Selling a brand new Daniel Defense SOPMOD Block II Upper. Upper was constructed by Daniel Defense and test fired by Daniel Defense. I fired 40-50 rounds to try it out. Performed amazing. Upper comes with Daniel Defense upper reciever, DD chromed lined barrel “16, This upper does not...
For sale, Miroku-Japan replica Winchester 1885 Falling Block 45-70 Government.
I do not know if this is low wall or high wall version. I cannot seem to find the information on this on the interwebs.
$800.00 OBO. Buyer pays FFL transfer fees. There is a pawn shop close to me that only charges...