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poizon [28]
3 years ago
6

What is the electron configuration of an element with atomic number 20?

Chemistry
2 answers:
VARVARA [1.3K]3 years ago
8 0
1s2,2s2.2p6,3s2,3p6,3d4,4s2
Arisa [49]3 years ago
3 0

Answer: 1s^22s^22p^63s^23p^64s^2

Explanation: The element with atomic number 20 consists 20 electrons and  as atomic number is specific to an element, atomic number is of element calcium.

The nearest noble gas to calcium is argon with 18 electrons with configuartion 1s^22s^22p^63s^23p^6 according to afbau's rule, in which orbitals are arranged in order of increasing energies.

Thus electronic configuartion of calcium in terms of noble gas configuration is:

Ca:20:[Ar]4s^2

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A student wants to examine a substance by altering the bonds within its molecules. Which of the following properties of the subs
Marrrta [24]

Question is incomplete, the complete question is as follows:

A student wants to examine a substance by altering the bonds within its molecules. Which of the following properties of the substance should the student examine?

A. Toxicity, because it can be observed by altering the state of the substance

B. Boiling point, because it can be observed by altering the state of the substance

C. Toxicity, because it can be observed by replacing the atoms of the substance with new atoms

D. Boiling point, because it can be observed by replacing the atoms of the substance with new atoms

Answer:

B.

Explanation:

A student can examine a substance without altering the bonds within the molecules by examining its boiling point.

The boiling point is the property of a substance, at which the substance changes its state, which is from solid to liquid, liquid to gas and others. So, examining the boiling point will alter the bonds within the molecules as the state of substance will change.

Hence, the correct answer is "B".

6 0
3 years ago
Which of the following is an example of a change of state?
lord [1]

Answer:

Option B

Explanation:

  • For Option A the state is not changing but just has different look now.
  • For Option B the state is changing from gas to liquid drops due to cold glass
  • For Option C it hasn't changed state as both corn and flower is solid
  • For Option D paper and ash are both solids

Therefore our answer must be Option B

6 0
1 year ago
4.3 moles of a gas are at a temperature of 28 degrees * C with a pressure of 1.631 atm. What volume does the gas occupy?
Shkiper50 [21]

Answer:

65.2L

Explanation:

Using the general gas equation;

PV = nRT

Where;

P = pressure (atm)

V = volume (Litres)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (Kelvin)

According to the information provided in this question,

P = 1.631 atm

V = ?

n = 4.3 moles

T = 28°C = 28 + 273 = 301K

Using PV = nRT

V = nRT/P

V = 4.3 × 0.0821 × 301 ÷ 1.631

V = 106.26 ÷ 1.631

V = 65.15

Volume of the gas = 65.2L

7 0
2 years ago
So i have this question for science.- What is the element with the atomic number 7. Thank you.
vredina [299]

Answer: the atomic number 7 is

Nitrogen

Explanation:

3 0
3 years ago
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PSYCHO15rus [73]
A homogenous mixture is uniform and thus hard to recognize as a mixture. An example is water!
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3 years ago
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