All categories

3 years ago

What is the lowest numbered energy level where a d sublevel is found?

Chemistry

2 answers:

SpyIntel [72]3 years ago

7 0

<span>The answer would be 3.</span>

UkoKoshka [18]3 years ago

4 0

Answer : The lowest numbered energy level where a 'd' sublevel is found is 3.

Explanation : According to the theory of order of electron filling;

The 4s orbitals is observed to have a lower energy than the 3d, and so the 4s orbitals are filled first.

It is known that 4s electrons are lost first during ionisation activity. Therefore, the electrons lost first will come from the highest energy level, furthest from the influence of the nucleus.

So, the lowest energy level where 'd' sub shell will be found is 3d.

You might be interested in

Please help!

ANEK [815]

Answer:

A- Physical, B- Chemical, C- chemical, D- Physical

Explanation:

A is physical because you can see it changing its form is changing.

B is Chemical because a new substance is formed creating the orange color of rust.

C is a Chemical reaction because it is being broken down so the banana itself is changing not just how we see it.

D is physical because we are just changing the shape/ size of the item, not anything to do with its substances.

8 0

2 years ago

Read 2 more answers

Select the correct answer.

Karo-lina-s [1.5K]

Answer: OB

Explanation:

The empirical formula of an element is the simplest formula of an element which shows the ratios of atoms of the each element present in a molecule of a compound .

4 0

2 years ago

Which element has the greatest density at STP?

son4ous [18]

Answer: Option (4) is the correct answer.

Explanation:

It is known that density is mass divided by volume.

Mathematically, Density = $\frac{mass}{volume}$

Since, density is directly proportional to mass. So, more is the mass of an element more will be its density.

Mass of magnesium is 24.305 g/mol.

Mass of barium is 137.327 g/mol.

Mass of beryllium is 9.012 g/mol

Mass of radium is 226 g/mol.

Hence, radium has more mass therefore it will have the greatest density at STP.

8 0

3 years ago

The period of of 440 Hz soundwave is how many seconds

Rudiy27

The period of any wave is one second. the measure of the wave, in this case 440 Hz, is how many wavelengths per second.

8 0

3 years ago

Gaseous methane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 7.9 g of methane is

Vikki [24]

Explanation:

The given reaction is as follows.

$CH_{4} + 2O_{2} \rightarrow CO_{2} + 2H_{2}O$

As it is known that number of moles equal mass divided by molar mass. Molar mass of methane is 16 g/mol.

Hence, No. of moles = $\frac{mass}{molar mass}$

= $\frac{7.9 g}{16 g/mol}$

= 0.493 mol

Molar mass of oxygen is 32 g/mol.

Hence, its number of moles = $\frac{mass}{molar mass}$

= $\frac{14.4 g}{32 g/mol}$

= 0.45 mol

As, it is shown from the reaction that 1 mole of methane needs 2 mole of oxygen.

Therefore, 0.493 mol of methane needs $2 \times 0.45 mol$ equals 0.9 moles of oxygen.

As there is only 0.45 moles of oxygen for the reaction. So, it means that oxygen is the limiting reagent.

Hence, for 0.45 moles of oxygen, methane required is as follows.

$\frac{0.45}{2}$ = 0.225 moles

So, 0.225 moles of methane is equal to $0.225 \times 16$ = 3.6 g

As, 3.6 g of methane reacts with oxygen. Therefore, amount of methane remains is calculated as follows.

(7.9 g - 3.6 g) = 4.3 g

Thus, we can conclude that the minimum mass of methane that could be left over by the chemical reaction is 4.3 g.

8 0

3 years ago