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3 years ago

Consider the n = 3 energy level in a hydrogen atom. how many electrons can be placed in this level?

Chemistry

2 answers:

Gennadij [26K]3 years ago

7 0

Answer:

18 electrons

Explanation:

There can be up to 2 electrons in 1 orbital.

In the level 3, there are 3 sublevels: 3s, 3p and 3d.

The sublevel 3s has 1 orbital 3s, thus, 1 × 2 e⁻ = 2 e⁻.
The sublevel 3p has 3 orbitals 3p, thus, 3 × 2 e⁻ = 6 e⁻.
The sublevel 3d has 5 orbitals 3d, thus 5 × 2 e⁻ = 10 e⁻.

The total number of electrons is 2 + 6 + 10 = 18 e⁻.

Alternatively, we can find the number of electrons in a level using the formula:

2n² = 2 × 3² = 2 × 9 = 18 electrons

Solnce55 [7]3 years ago

3 0

According to Neils Bohr, the atomic structure is described as electrons orbiting around the nucleus in orbitals. Each orbital holds two electrons that are oppositely spinning, according to Pauli's Exclusion Principle. These orbitals are then located in sub-shells of varying energy levels. There are 4 types of these sub-shells. In order of decreasing energy, they are the s, p ,d and f sub-shells. They differ in shape and energy levels. The s sub-shell holds 1 orbital, p holds 3, d holds 5 and f holds 7 orbitals. These sub-shells are oriented according to their principal quantum number, n. There are a total of 7 energy levels with 1 being the strongest and closest to the nucleus, and 14 being the weakest and farthest to the nucleus. You will see that electrons are filled from the strongest 1s orbitals, to the weakest 7f orbital.

Thus, in the energy level n=3, there are 3s, 3p, 3d and 3f sub-shells. The total electrons for this energy level is. therefore,

Total electrons = 1(2) + 3(2) + 5(2) + 7(2) = 32 electrons

The 2rd energy level can hold up to 16 orbitals containing two electron each. That would be 32 electrons all in all.

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If the complete conversion of 1.383g of XI2 results in the formation of 0.564g of XCl2,what is the atomic mass of the element X

Marina CMI [18]

Answer:

So X has an atomic mass of 55.05 u, and is probably Mn

Explanation:

Step1: Balance the equation

XI2 +Cl2 → XCl2 + I2

Step2: find the molar mass of the compounds

Compounds : 

X ⇒ Molar mass = M

XI2 ⇒ Molar mass = M + 2*126.9 u

XCl2 ⇒Molar mass = M + 2*35.45u

⇒For 1 mole XI2 we have 1 mole Cl2 reacting , as well as 1 mole XCl2 and 1 mole I2 produced.

Step 3: Calculating the atomic mass

(1.383g * XI2) / (M + 2*126.90 u) = (0.564g * XCl2) / ( M + 2 * 35.45u)

1.383 (M + 2 *35.45 u )= 0.564 (M + 2*126.90)

1.383M + 98.0547 = 0.564 M + 143.1432

1.383 M - 0.564 M =143.1432 - 98.0547

0.819 M = 45.0885

M = 55.05 u

So X has an atomic mass of 55.05 u ⇒ if we look at the periodic table we can find that the closest element is Manganese (Mn)

MnI2 + Cl2 → MnCl2 + I2

5 0

2 years ago

Explain why gases such as the oxygen found in tanks used as hospitals are compressed. why must care be taken to prevent compress

allochka39001 [22]

They are compressed so that a larger amount of gas can be stored in a smaller container. A greater mass confined to a smaller volume makes transporting and storing of gases easier. Increasing temperature increases pressure, and the cylinders might explode. Before compressed oxygen can be breathed, it must be decompressed.

7 0

3 years ago

Read 2 more answers

11. If two substances react and the temperature of the mixture decreases, the reaction

Goshia [24]

Answer:

a.endothermic reaction

5 0

3 years ago

Someone pls help me With this I will make you as brain

Artemon [7]

Explanation:

correct answer is g(x)=x+2

4 0

3 years ago

9) Give the set of four quantum numbers that could represent the extra electron added (using the Aufbau principle) to the neutra

Pie

Answer:

See explanation

Explanation:

9) If an extra electron is added to the neon atom, then the electronic configuration becomes; 1s2 2s2 2p6 3s1

This last electron has quantum numbers;

n=3, l=0, m=0 and s = +1/2

This is so because the 2s level is already filled so the extra electron must go into the 3s level. The orbital quantum number and the magnetic quantum number for the s orbital is zero.

10) Electron affinity is the energy released when one mole of gaseous atoms accept one mole of gaseous electrons to form one mole of gaseous ions having a negative charge.

In the second period, fluorine has the greatest electron affinity since electron affinity increases across the period. The noble gas, neon has an electron affinity of 0KJ/mol.

11) Ionization energy decreases down the group but increases across the period due to increase in the size of the nuclear charge and decrease in the distance between the nucleus and the outermost electron. Hence, the process; Br+(g) ---->Br2+(g) + e- has the greatest ionization energy. Recall that the second ionization is always higher than the first ionization energy.

12)The order of decreasing metallic character here is K> As> P. Even though As and P belong to the same group, we must note that metallic character increases down the group hence the order written above.

3 0

2 years ago