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Alekssandra [29.7K]
2 years ago
6

It’s easier to determine the elecron configurations for the p-block elements in periods 1,2,3 than to determine the electrons co

nfigurations for the rest of the p-block elements in the periodic table beacause
Chemistry
2 answers:
Scorpion4ik [409]2 years ago
5 0

Answer:It’s easier to determine the elecron configurations for the p-block elements in periods 1,2,3 than to determine the electrons configurations for the rest of the p-block elements in the periodic table beacause from period 4, specifically from the element 31 (Ga), the atoms start to fill the d orbitals, and the energy levels of the 3d orbitals ara quite similar to the energy levels of 4p orbitals. So, for the elements Cr and Cu the right configurations do not match the configurations predicted using Aufbau method and Hund rules. Those are not the only exceptions but the two first. All is due to the proximity of the energy of the d and p orbitals and the fact that the rearrangement of the electrons result in a lower energy

Explanation:

kotegsom [21]2 years ago
3 0
<span>It’s easier to determine the elecron configurations for the p-block elements in periods 1,2,3 than to determine the electrons configurations for the rest of the p-block elements in the periodic table beacause from period 4, specifically from the element 31 (Ga), the atoms start to fill the d orbitals, and the energy levels of the 3d orbitals ara quite similar to the energy levels of 4p orbitals. So, for the elements Cr and Cu the right configurations do not match the configurations predicted using Aufbau method and Hund rules. Those are not the only exceptions but the two first. All is due to the proximity of the energy of the d and p orbitals and the fact that the rearrangement of the electrons result in a lower energy level. </span>
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Which of the following equations is balanced?
stiv31 [10]

Answer:

A) 4P + 5O₂  → 2P₂O₅

Explanation:

A) 4P + 5O₂  → 2P₂O₅

This equation is balanced. There are four phosphorus and ten oxygen atoms are on both side of equation.

B) 5P + 4O₂    →    2P₄O₅

This equation is not balanced. There are five phosphorus and eight oxygen atoms on left, eight phosphorus ten oxygen on right side of equation.

C) 2P + O₂    →      P₂O₅

This equation is not balanced. There are two phosphorus, two oxygen atoms on left and two phosphorus five oxygen on right side of equation.

D) 4P + 2O₂    →   2P₄O₅

This equation is not balanced. There are four phosphorus, four oxygen atoms on left and eight phosphorus ten oxygen on right side of equation.

4 0
3 years ago
Whats the atomic mass of an atom
lapo4ka [179]
Atomic mass is usually defined by the total number of protons, neutrons and electrons in a single atom. You can measure it by spectrometry.
8 0
3 years ago
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What is the mass in milligrams of 4.30 moles of sodium?use âeâ for âÃ10" and use significant figures?
Elis [28]

First, calculate the mass of sodium in g with the help of molar mass and number of moles.

Number of moles = \frac{given mass in g}{molar mass}   (1)

Molar mass of sodium =23 .0 g/mol

Substitute the given value of number of moles and molar mass of sodium in formula (1)

4.30 moles = \frac{given mass in g}{23.0 g/mol}   (1)

4.30 moles\times 23.0 g/mol = mass in g   (1)

mass of sodium in g = 98.9 g

Now, according to conversion factor, 1 g = 1000 mg

So, 98.9 g of sodium = 98.9 \times 1000  mg

= 98900 mg of sodium

Thus, mass of sodium in mg  =9.89 \times 10^{4} mg






8 0
3 years ago
Why do we need a “mole”?
Ivan
Wdym mole like the animal or something else ?
4 0
2 years ago
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Using PV = nRT, we can calculate the moles of the sample.
874 mmHg = 116,524 Pa
n = PV/RT
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n = 9.98 x 10⁻³ mol

moles = mass / Mr
Mr = 0.271/9.98 x 10⁻³
Mr = 27.2
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Repeat units = 27.2 / 14 ≈ 2

Formula of substance:
C₂H₄

Combustion equation:
C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

1 mole produces 2 moles of CO₂, so 3 moles will produce 6 moles CO₂
7 0
2 years ago
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