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Anestetic [448]
3 years ago
13

Why is helium in group 18 on the periodic table though it only has 2 valence electrons?

Chemistry
1 answer:
damaskus [11]3 years ago
8 0
<span> strictly speaking, a molecule has at least two atoms. ... Atoms with full valence electron shells are stable. Full Text[ edit ] The noble gases are a group of chemical elements that make up Group 18 on the periodic table.</span>
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Express the quantity 24.2×10-5 m in mm. express your answer using three significant figures.
sergiy2304 [10]
I think you meant 2.42*10^-6
Remember, the first digit must be between 1 and 10 or - 1 and - 10.
(2.42*10^-6)(1000)
=0.242mm
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3 years ago
When 0.50 L of a 12 M solution is diluted to 1.0 L, what is the resulting molarity?
Lyrx [107]

Answer:

The resulting molarity is 6M.

Explanation:

A dilution consists of the decrease of concentration of a substance in a solution (the higher the volume of the solvent, the lower the concentration).

We use the formula for dilutions:

C1 x V1 = C2 x V2

12 M x 0,5L = C2 x 1,0 L

C2= (12 M x 0,5 L)/1,0 L

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