Meaning of Brackets

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Yazmin Bocanegra 3L
Posts: 51
Joined: Thu Jul 25, 2019 12:17 am

Meaning of Brackets

Postby Yazmin Bocanegra 3L » Fri Oct 25, 2019 8:50 pm

What do the brackets mean in chemistry?
For example, [Ar], [Ne], [He], etc.

Adrianh72
Posts: 48
Joined: Sat Aug 17, 2019 12:16 am

Re: Meaning of Brackets

Postby Adrianh72 » Fri Oct 25, 2019 9:37 pm

Here, they indicate that the shorthand electron configuration is being used. Meaning that it starts with the previous noble gas and then continues from there rather than starting at 1s.

Ellen Amico 2L
Posts: 101
Joined: Thu Sep 19, 2019 12:16 am

Re: Meaning of Brackets

Postby Ellen Amico 2L » Fri Oct 25, 2019 9:42 pm

Instead of writing out the entire electron configuration starting at 1s for an element, using the brackets of the closest previous noble gas is a shortcut and the configuration for an element will continue from there.

TYun_1C
Posts: 52
Joined: Wed Sep 11, 2019 12:16 am

Re: Meaning of Brackets

Postby TYun_1C » Fri Oct 25, 2019 9:48 pm

Brackets are used when citing the electron configuration in the shorthand. You only list the outer orbitals after the last noble gas. You start with the next s orbital after that noble gas.

sbottomley3a
Posts: 50
Joined: Wed Sep 18, 2019 12:19 am

Re: Meaning of Brackets

Postby sbottomley3a » Fri Oct 25, 2019 11:04 pm

We do this as an easy way to shorten the written electron configuration. Inside of the brackets is the closest noble gas from the row above, since their electron configuration doesn't change, and then next to it we write out the next electrons that our element has above the noble gas.

Katherine Brenner 3H
Posts: 73
Joined: Wed Sep 18, 2019 12:18 am

Re: Meaning of Brackets

Postby Katherine Brenner 3H » Fri Oct 25, 2019 11:06 pm

Brackets indicates something is a noble gas. I was originally confused on this as well so dont worry!

405268063
Posts: 102
Joined: Thu Jul 25, 2019 12:17 am

Re: Meaning of Brackets

Postby 405268063 » Fri Oct 25, 2019 11:15 pm

The brackets denote a noble gas, and it's just used for efficiency purposes so you don't have to use a huge list to describe the ground state of an atom.

Jillian C 4C
Posts: 51
Joined: Sat Jul 20, 2019 12:16 am

Re: Meaning of Brackets

Postby Jillian C 4C » Sat Oct 26, 2019 5:25 pm

The brackets indicate the closest noble gas's electronic configuration so that the configuration of the given atom does not have to start from 1s.


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