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Mazyrski [523]
3 years ago
7

Which element has 3 valence electrons in the 4d sublevel? A. V B. Nb C. Cu D. Tl

Chemistry
2 answers:
Lilit [14]3 years ago
7 0
Nb, the transition metal(d) subshell will always be n-1, meaning the 3d subshell will be in row(period) 4. So if it’s 4d then it is row(period) 5, and if it has 3 valence electrons then the element is located in column V, or the third column in the transition metal section.
scZoUnD [109]3 years ago
4 0

<u>Answer:</u> The correct answer is Option B.

<u>Explanation:</u>

Valence electrons are defined as the electrons which are present in outermost shell of an atom. This is determined by the electronic configuration of an element.

For the given options:

<u>Option A:</u> Vanadium (V)

The atomic number of this atom is 23 and number of electrons that are present are 23. The electronic configuration of vanadium is:

V:[Ar]3d^34s^2

This element does not have 3 electrons in 4d-subshell.

<u>Option B:</u> Niobium (Nb)

The atomic number of this atom is 41 and number of electrons that are present are 41. The electronic configuration of niobium is:

Nb:[Kr]4d^35s^2

This element have 3 electrons in 4d-subshell.

<u>Option C:</u> Copper (Cu)

The atomic number of this atom is 29 and number of electrons that are present are 29. The electronic configuration of copper is:

Cu:[Ar]3d^{10}4s^1

This element does not have 3 electrons in 4d-subshell.

<u>Option D:</u> Thallium (Tl)

The atomic number of this atom is 81 and number of electrons that are present are 81. The electronic configuration of thallium is:

Tl:[Xe]4f^{14}5d^{10}6s^26p^1

This element does not have 3 electrons in 4d-subshell.

Hence, the correct answer is Option B.

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The Answer is eight.

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4 0
3 years ago
What would the corresponding
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7,9,11

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4 0
1 year ago
Which atom would tend to gain 1 valence electrons from another atom in order to become stable
Mrrafil [7]

Answer: Option (D) is the correct answer.

Explanation:

Atomic number of chlorine is 17 and its electronic distribution is 2, 8, 7.  

So, in order to attain stability it tends to gain one electron from a donor atom. Therefore, a chlorine ion is formed as Cl^{-1}.

As it gains only one electron that is why, -1 charge occurs.

Whereas Ar is a noble gas with atomic number 18. As it has completely filled octet so it will be unreactive in nature as it is already stable.

Similarly, He is also a noble gas so it is unreactive in nature.

Atomic number of boron (B) is 5 with electronic distribution 2, 3. So, in order to attain stability it needs to lose 3 electrons.

Thus, we can conclude that Cl is the atom which tends to gain 1 valence electron from another atom in order to become stable.

4 0
3 years ago
HELP FOR FINAL
Dahasolnce [82]

Volume of CO₂ obtained : 13 L

<h3>Further explanation</h3>

Reaction

C₂H₅OH + 3 O₂ ⇒ 2 CO₂ + 3 H₂0 + 8842 Joules

moles of ethanol=0.28

From equation, mol ratio ethanol : CO₂ = 1 : 2, so mol CO₂ :

\tt \dfrac{2}{1}\times 0.28=0.56

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.

Then volume of CO₂ :

\tt V~CO_2=mol\times 22.4=0.56\times 22.4=12.544\approx 13~L

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2 years ago
How many electrons are orbit the nucleus of an atom with an atomic number of 60?​
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