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puteri [66]
3 years ago
9

What is the total number of electrons in the valence shell of an atom of aluminum in the ground state?

Chemistry
2 answers:
Gnoma [55]3 years ago
6 0

Answer:

C. 3

Explanation:

If you look at aluminum (Al) in the Periodic Table of the Elements, you will see that its electron configuration is 2-8-3.  The last number indicates the valence shell, which contains three electrons.

artcher [175]3 years ago
5 0
The answer is (3) 3. The outer shell of an atom is called valence shell. And the ground state is the lowest energy state of an atom. Aluminum has a electron distribution of 2, 8, 3. So the outer shell has 3 electrons.
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What is the equation for the energy levels of the hydrogen atom
Kaylis [27]

Answer:     E = (13.6 eV) [1/nf² - 1/ni²]  

En = (-13.6 eV)/n²

where n=1,2,3...

Explanation:

According to Bohr's theory each spcified energy value( E1,E2,E3...) is called energy level of the atom and the only allowable values are given by the equation

En = (-13.6 eV)/n²

The energy change (ΔE) that accompaies the leap of an electron from one energy level to another is given by equation

E = (13.6 eV) [1/nf² - 1/ni²]  

8 0
3 years ago
Given the balanced equation representing a reaction: 4Al(s) 3O2(g) → 2Al2O3(s) As the aluminum loses 12 moles of electrons, the
S_A_V [24]
The answer is (2) gains 12 moles of electrons. In every chemical reaction, the electrons will not be destroyed or created, it will only transfer. So the Al loses electrons, the oxygen needs to gain the same amount of electrons.
8 0
3 years ago
Shelby measured the volume of a cylinder and determined it to be 54.5 cm3 . The teacher told her that she was 4.25% too high in
balu736 [363]

Answer:

V = 56.816 cm³

Explanation:

Given that,

The measured value of the cylinder is 54.5 cm³

The percent error in the measurement of the volume is 4.25%

We need to find the actual volume of the cylinder.

Firstly, we can find the error in the calculation as follows :

E=54.5 \times \dfrac{4.25}{100}=\pm2.316

It is mentioned in the problem that, the teacher told her that she was 4.25% too high in her determination of the volume. It would mean that,

Total volume = 54.5 + 2.316 = 56.816 cm³

Hence, the actual volume of the cylinder is 56.816 cm³.

7 0
3 years ago
How many moles are present in 2.3 x 1023 molecules of NH3?
avanturin [10]

Answer:

<h2>0.38 moles</h2>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

n =  \frac{N}{L} \\

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

n =  \frac{2.3 \times  {10}^{23} }{6.02 \times  {10}^{23} }  =  \frac{2.3}{6.02}  \\  = 0.382059...

We have the final answer as

<h3>0.38 moles</h3>

Hope this helps you

5 0
2 years ago
When is the oxidation state of a metal indicated in the name of a compound?
Nitella [24]

Answer:

B

Explanation:

The oxidation state is present in metals that have multiple oxidation states. Most transition metals have multiple oxidation states. Such as, Iron(II) and Iron (III).

4 0
3 years ago
Read 2 more answers
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