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3 years ago

How many electrons are in the highest occupied energy level of an element in group 5a

Chemistry

1 answer:

Setler79 [48]3 years ago

5 0

Answer:

3 electrons

Explanation:

The elements of group 5A of the periodic table are the following:

nitrogen, sodium, arsenic, antimony and bismuth.

To determine the amount of electrons in the last energy level we need to know the electronic configuration of each element.

Electronic configuration

N: [He] 2s2 2p3

P: 1s2 2s2 2p6 3s2 3p3

As: [Ar] 3d10 4s2 4p3

Sb: [Kr] 4d10 5s2 5p3

Bi: [Xe] 4f14 5d10 6s2 6p3

As we can see they all have 3 electrons in their last energy level .

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If a object started moving have did it’s velocity change?

Otrada [13]

Answer:

the velocity did change

Explanation:

velocity is the rate of change of its position with respect to a frame of reference.

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4 years ago

How many milliliters of 2.15 wt% dimethylglyoxime solution should be used to provide a 50.0% excess for Reac- tion 7-2 with 0.99

Lilit [14]

This is an incomplete question, here is a complete question.

How many milliliters of 2.15 wt% dimethylglyoxime solution should be used to provide a 50.0% excess for Reaction 7-2 with 0.998 4 g of steel containing 2.07 wt% Ni? Assume that the density of the dimethylglyoxime solution is 0.790 g/mL.

Answer : The volume of solution is, 7.195 mL

Explanation :

First we have to calculate the mass of Ni.

Mass of Ni = $0.998g\times 2.07\% =0.998g\times \frac{2.07}{100}=0.0206g$

Now we have to calculate the moles of Ni.

$\text{Moles of }Ni=\frac{\text{Given mass }Ni}{\text{Molar mass }Ni}=\frac{0.0206g}{58.7g/mol}=0.0003509mol$

Now we have to calculate the moles of dimethylglyoxime.

As we know that 1 mole of Ni requires 2 moles of dimethylglyoxime.

So, 0.0003509 mole of Ni requires (0.0003509×2=0.0007018) moles of dimethylglyoxime.

For 50% excess reaction number of moles of dimethylglyoxime = 0.0007018 × 1.5 = 0.0010527 g

Now we have to calculate the mass of dimethylglyoxime.

$\text{ Mass of dimethylglyoxime}=\text{ Moles of dimethylglyoxime}\times \text{ Molar mass of dimethylglyoxime}$

Molar mass of dimethylglyoxime = 116.12 g/mole

$\text{ Mass of dimethylglyoxime}=(0.0010527moles)\times (116.12g/mole)=0.1222g$

Now we have to calculate the weight of solution.

As, 2.15 g of dimethylglyoxime present in 100 g of solution

So, 0.1222 g of dimethylglyoxime present in $\frac{100}{2.15}\times 0.1222=5.684g$ of solution

Now we have to calculate the volume of solution.

$Density=\frac{Mass}{Volume}$

$0.790g/mL=\frac{5.684g}{Volume}$

Volume of solution = 7.195 mL

Therefore, the volume of solution is, 7.195 mL

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3 years ago

In the sun, hydrogen is converted to ____________________ through nuclear fusion.

lana66690 [7]

Answer:

Helium

In the sun, hydrogen is converted to __<u>Helium</u>__ through nuclear fusion.

4 0

3 years ago

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what order does covalent bond, dipole-dipole, hydrogen bond, ionic bond, metalic bond, and london dispersion bond for strength?

jarptica [38.1K]

Answer:The major types of solids are ionic, molecular, covalent, and metallic. ... (network) , or metallic, where the general order of increasing strength of interactions. ... In ionic and molecular solids, there are no chemical bonds between the ... by dipole –dipole interactions, London dispersion forces, or hydrogen ...

Explanation:

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3 years ago

If 35.0 g of CH₃OH (MM = 32.0 g/mol) are dissolved in 500.0 mL of solution, what is the concentration of CH₃OH in the solution?

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2 years ago