chemical formulas

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Noh_Jasmine_1J
Posts: 71
Joined: Fri Sep 28, 2018 12:15 am

chemical formulas

Postby Noh_Jasmine_1J » Thu Oct 04, 2018 4:15 pm

hi, I can confused on when to use subscripts for certain elements on the periodic table. For example, I don't know understand why chlorine gas is written as Cl2 instead of just Cl (M.15)

Sarah_Kang_2K
Posts: 72
Joined: Fri Sep 28, 2018 12:23 am

Re: chemical formulas

Postby Sarah_Kang_2K » Thu Oct 04, 2018 4:17 pm

Cl on its own would refer to the ion form (Cl-). Cl2, along with N2, H2, and O2 are all gaseous forms of the elements.

Germar G 4F
Posts: 38
Joined: Fri Sep 28, 2018 12:28 am

Re: chemical formulas

Postby Germar G 4F » Thu Oct 04, 2018 4:20 pm

There is a list of diatomic elements, which means they get a subscript of 2 every time you write them in a chemical equation. The diatomic elements are Hydrogen, Nitrogen, Fluorine, Oxygen, Iodine, Chlorine, and Bromine. Remember them with this mnemonic:

Have No Fear Of Ice Cold Beer
Last edited by Germar G 4F on Thu Oct 04, 2018 4:56 pm, edited 1 time in total.

Camille Marangi 2E
Posts: 60
Joined: Fri Sep 28, 2018 12:26 am

Re: chemical formulas

Postby Camille Marangi 2E » Thu Oct 04, 2018 4:24 pm

Chlorine is a diatomic element. Diatomic elements are pure elements that form molecules consisting of two atoms bonded together because they are extremely unstable alone due to their *almost* full valence shell. There are 7 of these diatomic elements and the easiest way I find to remember them is to use the mnemonic device Dr. Brinclhof (Br I N Cl H O F) where Br= bromine, I= Iodine, N=nitrogen, Cl=chlorine, H-hydrogen, O=oxygen, and F=fluorine

Arshia Ramesh 1G
Posts: 35
Joined: Fri Sep 28, 2018 12:18 am

Re: chemical formulas

Postby Arshia Ramesh 1G » Thu Oct 04, 2018 11:29 pm

BrINClHOF


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