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Alekssandra [29.7K]
3 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]3 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]3 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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Write the formulas of the acids which liberated hydrogen gas when reacting with magnesium metal
Ipatiy [6.2K]
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 Followings are some balanced reactions of Mg with acids.

Mg(s) + H₂SO₄(aq) → MgSO₄(aq) + H₂(g)

Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)

Mg(s) + 2HNO₃(aq) → Mg(NO₃)₂(aq) + H₂(g)
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3 years ago
Give a definition of mixture? <br> Why air is called a mixture?
anzhelika [568]

Question

Give a definition of mixture?

Why air is called a mixture?

Answer:

mixture - substance made by combining two more different materials in such a way that no chemical reaction occurs.

Air is a mixture  because  it is composed of gases like inert gases, carbon dioxide, oxygen, nitrogen an so on. Also dust particles are present in the atmosphere so air is a mixture .

Explanation:

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3 years ago
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Answer:

The group number in the periodic table represents number of valence electrons of the elements in a certain group.

Explanation:

There are s, p, d, and f blocks, which you can see in periodic table

The s-block and p-block together are usually considered main-group elements, the d-block corresponds to the transition metals, and the f-block encompasses nearly all of the lanthanides (like lanthanum) and the actinides (like actinium)

There are three main principles, which may useful for you:

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  • The Aufbau process describes the process of adding electron configuration to each individualized element in the periodic table.

Hope this helps!

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The reaction is given as

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As for Fe mole =156.2g/55.847=2.7969~2.797

The ratio b/w CO and Fe is 3:2

Moles of CO needed= 2.797x3/2=4.1955

Mass of CO needed= 4.195mol x 28.01g/mol= 117.515g

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Answer:

20m/s.

Explanation:

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