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bixtya [17]
2 years ago
15

Which of the following notations is the correct noble gas configuration for Li

Chemistry
2 answers:
Anettt [7]2 years ago
8 0

Noble gas configuration for Li : [He]2s¹

<h3>Further explanation </h3>

In an atom, there are levels of energy in the shell and sub-shell

This energy level is expressed in the form of electron configurations.

Lithium with atomic number 3, then the electron configuration:

1s²2s¹

And for noble gas configuration or it can be called Condensed electron configurations :

[He]2s¹

wlad13 [49]2 years ago
8 0

Answer:

[He]2s¹

Explanation:

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A 45 gram piece of metal has a volume of 18cm3. What is the density of this metal?
ruslelena [56]

Answer:

2.5

Explanation:

density = mass/volume

density = 45gram/18cm cubed

density = 2.5

I THINK IT'S 2.5

6 0
3 years ago
A solution is prepared by condensing 4.00 L of a gas,
vredina [299]

Answer:

-2.3 ºC

Explanation:

Kf (benzene) = 5.12 ° C kg mol – 1

1st - We calculate the moles of condensed gas using the ideal gas equation:

n = PV / (RT)

P = 748/760 = 0.984 atm

T = 270 + 273.15 = 543.15 K

V = 4 L

R = 0.082 atm.L / mol.K

n = (0.984atm * 4L) / (0.082atm.L / K.mol * 543.15K) = 0.088 mol

Then, you calculate the molality of the solution:

m = n / kg solvent

m = 0.088 mol / 0.058 kg = 1.52mol / kg

Then you calculate the decrease in freezing point (DT)

DT = m * Kf

DT = 1.52 * 5.12 = 7.8 ° C

Knowing that the freezing point of pure benzene is 5.5 ºC, we calculate the freezing point of the solution:

T = 5.5 - 7.8 = -2.3 ºC

5 0
3 years ago
Which of the above electron dot structures is wrong?
andre [41]

Answer:

Al

Explanation:

Aluminum (Al) is in the same group as Boron (B) so it should have three electrons or dots around it.

Hope that helps.

8 0
3 years ago
Read 2 more answers
What is the atomic radius <br> of mercury?
cricket20 [7]

The answer is 155 pm, hope this helps!

4 0
2 years ago
How many mol are in 8.23 x 10^24 formula units of calcium carbonate
tensa zangetsu [6.8K]

Answer:

13.7 moles

Explanation:

Given data:

Number of moles calcium carbonate = ?

Formula units calcium carbonate= 8.23 × 10²⁴

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 8.23 × 10²⁴ formula units:

one mole = 6.022 × 10²³ formula units

8.23 × 10²⁴ formula units × 1 mole /6.022 × 10²³ formula units

13.7 moles

7 0
3 years ago
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