Answer:
chlorine
Explanation:
sodium chloride, it is missing chlorine
Explanation:
In chemistry, a mole is the base unit of the amount of substance in a system containing elementary entities (atoms, molecules, ions, electrons), and one mole of substance corresponds to the Avogadro's constant or 
entities. The stoichiometry equation that relates the amount of substance into the measurement in moles is
,
where 
is the number of moles, 
is the amount of substance and 
is the Avogadro's constant.
Therefore,
.
During Summer?? I don't know if this is right??
Hydrofluoric acid (HF) is a Group 7A(17) element or compound that fits each description or use:(c) Weakest hydrohalic acid.
When hydrohalic acids dissolve in water to produce acids, they are frequently referred to as hydrogen halides. They have the formula HX, where X can be any of the halogens. They are diatomic organic compounds. Iodine, chlorine, bromine, and fluorine are a few of the halogens.
Given that fluorine is the most electronegative of the four halides and iodine the least, it seems contradictory that the acidity of the series of hydrohalic acids, HF, HCl, HBr, and HI, increases from HF through HI.
The acid hydrofluoric acid (HF) is the weakest hydrohalic acid. Its status as a weak acid is primarily due to the fact that it does not entirely dissociate in water. In essence, it defies the description of a strong acid. On the other hand, after dissociation, the ions it creates are firmly bonded to one another.
To know more about hydrohalic acid refer to: brainly.com/question/12210499
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C) Fe
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² <u>3d⁶</u>
