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3 years ago

An atom has the following electron configuration.

Chemistry

2 answers:

vagabundo [1.1K]3 years ago

8 0

Answer: The number of valence electron in the given atom are 5

Explanation:

Valence electrons are defined as the electrons which are present in the outermost shell of an atom. Outermost shell has the highest value of 'n' that is principal quantum number.

For the given electronic configuration: $1s^22s^22p^63s^23p^64s^23d^3$

When an element belongs to d-block, the number of valence electrons are present in $ns,np\text{ and }(n-1)d$ orbitals

Here, n = 4

The electrons in '4s' orbital = 2

The electrons in '3d' orbital = 3

Number of valence electrons = 2 + 3 = 5

Hence, the number of valence electron in the given atom are 5

V125BC [204]3 years ago

3 0

Answer:

Explanation:

The valence electrons are the electrons that are located in the outermost shel of an atom.

Writing the configuration properly, we have:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³

In this atom, there is a total number of 23 electrons. This is a transition metal.

The 4s and 3d orbitals are in the outermost energy levels and so their electrons are valent.

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Lithium nitride reacts with water to produce ammonia and lithium hydroxide according to the equation, Li3N(s) + 3H2O (L) -->

Gemiola [76]

Answer:

0.480 grams

Explanation:

Li₃N(s) + 3D₂O (L) --------------------------> ND₃(g) + 3LiOD (aq)

1 : 3 : 1 : 3

Number of moles (n) = Mass in gram/ Molar Mass

Mass of ND₃ = 160 mg

= 0.16 g

Molar mass of ND₃= [14 + (3 x 2.014 )]

= 14 + 6.042

= 20.042 g/mol

Number of moles of ND₃ = 0.16/20.042

= 0.007983 moles

From the reaction equation, the mole ratio between Heavy water (D₂O ) and ND₃ is 3: 1.

This implies that the number of moles of Heavy water (D₂O ) required

= 3 x 0.007983 moles

= 0.023949 moles

Molar mass of Heavy water (D₂O )= [(2.014 x 2) + 16]

= 20.028 g/mol

Mass in grams of Heavy water (D₂O )= Number of moles x Molar mass

= 0.023949 x 20.028

= 0.4797 grams

≈ 0.480 grams

3 0

4 years ago

How do scientists test ideas about chemical evolution?

maksim [4K]

I think they test ideas about chemical evolution by doing experiments. Hope this helps

4 0

4 years ago

Read 2 more answers

Consider a transition of the electron in the hydrogen atom from n=3 to n=7.

kow [346]

Answer:

For a: The wavelength of light is $1.005\times 10^{-6}m$

For b: The light is getting absorbed

Explanation:

For a:

To calculate the wavelength of light, we use Rydberg's Equation:

$\frac{1}{\lambda}=R_H\left(\frac{1}{n_i^2}-\frac{1}{n_f^2} \right )$

Where,

$\lambda$ = Wavelength of radiation

$R_H$ = Rydberg's Constant = $1.097\times 10^7m^{-1}$

$n_f$ = Higher energy level = 7

$n_i$ = Lower energy level = 3

Putting the values in above equation, we get:

$\frac{1}{\lambda }=1.097\times 10^7m^{-1}\left(\frac{1}{3^2}-\frac{1}{7^2} \right )\\\\\lambda =1.005\times 10^{-6}m$

Hence, the wavelength of light is $1.005\times 10^{-6}m$

For b:

There are two ways in which electrons can transition between energy levels:

Absorption spectra: This type of spectra is seen when an electron jumps from lower energy level to higher energy level. In this process, energy is absorbed.
Emission spectra: This type of spectra is seen when an electron jumps from higher energy level to lower energy level. In this process, energy is released in the form of photons.

As, the electron jumps from lower energy level to higher energy level. The wavelength is getting absorbed.

6 0

3 years ago

How many grams of nh3 can be produced from 3.72 mol of n2 and excess h2.

olganol [36]

N₂ + 3H₂ ⇒ 2NH₃
1mol : 2mol
3,72mol : 7,44mol

n = 7,44mol
M = 17g/mol

m = n * M = 7,44mol * 17g/mol = 126,48g

7 0

3 years ago

Which two factors affect the amount of thermal energy an object has?

Neporo4naja [7]

Answer:

Explanation:

What would the answer be?

6 0

3 years ago