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3 years ago

Why are valence electrons important

2 answers:

8 0

Valence electrons are the electrons in the outermost shell of an atom. Now you might be asking why are valence electrons so important well valence electrons are the electrons in the highest energy level of an atom. They are important because these electrons are involved in chemical bond formation.

koban [17]3 years ago

4 0

Explanation:

The electrons in the outermost shell of an atom are the valence electrons. These electrons are the most loosely held in an atom.

The energy required to remove these electrons are not as great as those of the inner shell electrons.

Atoms of some elements show no tendency to combine with other atoms because they have completely filled outer energy levels.
Their outermost shell, valence shell and the electron numbers are complete for them. These are the noble gases.
other atoms share or exchange their valence electrons in order to have a stable configuration.
The valence electrons are involve in inter-atomic bond formation and interactions
Also the distribution of these electrons determines inter-molecular interactions between molecules.

Learn more:

valence electrons in metalloids brainly.com/question/3023499

#learnwithBrainly

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Knowing the molarity of a solution is more meaningful than knowing whether a solution is dilute or concentrated. explain.

ser-zykov [4K]

Molarity is a measure of a solution's concentration calculation by getting the ratio of the number of moles of solute to the total volume of solution. This has a unit of M or molar, equivalent to mole/L.

It is more important and meaningful to know the molarity rather than if the solution is dilute or concentrated because molarity gives the QUANTITATIVE approach of knowing the concentration while the second one only gives us the QUALITATIVE description of the solution. Hence, we are able to calculate for other unknown parameters if we have the molarity known.

5 0

3 years ago

Which would be the best way to represent the concentration of a 1. 75 M K2CrO4 solution? 1. 75% K2CrO4 [K2CrO4] (K2CrO4) K2CrO4,

tekilochka [14]

The amount of the solute present in the given solution is called the concentration. The best way to represent the concentration of the solution is $\rm [K_{2}CrO_{4}].$

<h3>What is molar concentration?</h3>

Molar concentration is the molarity of the solution that is the measure of the concentration of the solute dissolved in the solution.

The formula for calculating molar concentration is given as,

$\rm Molarity = \dfrac{\text{moles of solute}}{\text{Solution in L}}$

The concentration of any substance is represented in the square bracket like $\rm [X]$ or $\rm [K_{2}CrO_{4}].$

Therefore, option B. $\rm [K_{2}CrO_{4}]$ is the representation of the concentration.

Learn more about the molarity here:

brainly.com/question/1532164

8 0

2 years ago

What happens to the population size of each of the pond organisms when the perch population size is decreased? How many of the s

lana [24]

I found a presentation of Food web of a pond that will greatly connect with the above problem. http://www.eduweb.com/portfolio/earthsystems/food/foodweb4.html

Normal setting:
Species Pop. size
Blue heron Medium
Perch Medium
Bass Medium
Minnows Medium
Inverts Medium
Algae Medium

If PERCH population size decreases,
Species Pop. sizeBlue heron LowPerch LowBass MediumMinnows HighInverts HighAlgae Low

As you can see, 4 other species are affected when the Perch population size decreased. Bass is not affected.

8 0

3 years ago

What is the percent composition by mass of sulfur in the compound mgso4

Margaret [11]

Answer:

26.7% is the percent composition by mass of sulfur in a compound named magnesium sulfate.

Explanation:

Molar mass of compound = 120 g/mol

Number of sulfur atom = 1

Atomic mass of sulfur = 32 g/mol

Percentage of element in compound :

$=\frac{\text{Number of atoms}\times \text{Atomic mass}}{\text{molar mas of compound}}\times 100$

Sulfur :

$=\frac{1\times 32 g/mol}{120 g/mol}\times 100=26.7\%$

26.7% is the percent composition by mass of sulfur in a compound named magnesium sulfate.

6 0

3 years ago

What tool measures mass?

Tatiana [17]

Answer:

balances and scales, measurement transducers, vibrating tube sensors, Newtonian mass measurement devices and the use of gravitational interaction between objects.

Explanation:

4 0

3 years ago