All categories

3 years ago

What is the first example in the periodic table where the Aufbau principle is not followed?

Chemistry

1 answer:

ASHA 777 [7]3 years ago

6 0

Answer:

the 4s subshell is lower in energy than the 3d subshell

Explanation:

In the element number 24 which is chromium

the electronic configuration should be according to Aufbau principle

will be = $1s^22s^22p^63s^23p^64s^23d^4$

but in reality it is = $1s^22s^22p^63s^23p^64s^13d^5$

The 6 electrons in the outermost shell will be divided as 5 in 3d subshell and 1 in 4s shell, because half filled orbital $4s^13d^5$ will be more stable than $4s^23d^4$ .

You might be interested in

Please help me..<br>what is carbon 1/12

tatuchka [14]

Answer:

It is expressed as a multiple of one-twelfth the mass of the carbon-12 atom, 1.992646547 × 10−23 gram, which is assigned an atomic mass of 12 units. ... In this scale 1 atomic mass unit (amu) corresponds to 1.660539040 × 10−24 gram.

6 0

3 years ago

A lake in rural maine drops in ph from 7 to 5 as a result of acid rain falling into it. how has the h+ ion concentration change

Jlenok [28]

The H+ concentration in the lake has increased as a result of the acid rain.
The original pH of the lake was 7, which mean the water is neutral, but due to the acid rain, it drops to 5. This means, that the water has become acidic and how have more hydrogen ion. The H+ concentration in the lake has 100 times compares with its original pH.

3 0

4 years ago

What is one source of CO?

Murljashka [212]

Answer:

Carbon monoxide (CO)—a colorless, odorless, tasteless, and toxic air pollutant—is produced in the incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, coal, and wood. The largest anthropogenic source of CO in the United States is vehicle emissions.

Explanation:

Hope this helps- good Luck! ^w

5 0

4 years ago

What Most Often Causes The Availability Of Water To Change?

Margaret [11]

Answer:the answer is C

Explanation:

8 0

3 years ago

A compound has a molar mass of 90. grams per mole and the empirical formula CH2O. What is the molecular formula of this compound

k0ka [10]

Answer:

C₃H₆O₃

Explanation:

Data:

EF = CH₂O

MM = 90. g/mol

Calculations:

EF Mass = (12.01 + 2.016 + 16.00) u = 30.03 u

The molecular formula is an integral multiple of the empirical formula.

MF = (EF)ₙ

$n = \dfrac{\text{MF Mass}}{\text{EF Mass }} = \dfrac{\text{90. u}}{\text{30.03 u}} = 3.00 \approx 3$

MF = (CH₂O)₃ = C₃H₆O₃

7 0

4 years ago