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3 years ago

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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2 years ago

The combustion of propane may be described by the chemical equation C 3 H 8 ( g ) + 5 O 2 ( g ) ⟶ 3 CO 2 ( g ) + 4 H 2 O ( g ) C

Kipish [7]

Answer: 72 grams of $O_2(g)$ are needed to completely burn 19.7 g $C_3H_8(g)$

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According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Putting in the values we get:

$\text{Number of moles}=\frac{19.7g}{44g/mol}=0.45moles$

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According to stoichiometry:

1 mole of $C_3H_8$ requires 5 moles of oxygen

0.45 moles of $C_3H_8$ require= $\frac{5}{1}\times 0.45=2.25$ moles of oxygen

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Bonds between carbon and oxygen are more polar than bonds between sulfur and oxygen. nevertheless, sulfur dioxide (so2) exhibits

Zepler [3.9K]

Bonds between carbon and oxygen are more polar than bonds between sulfur and oxygen. nevertheless, sulfur dioxide (SO₂) exhibits a dipole moment while carbon dioxide (CO₂) does not because of the difference in their shape, CO₂ is having linear geometry thus exhibit zero dipole moment while SO₂ is having bent shape thus exhibit dipole moment. So, despite the fact that bonds between carbon and oxygen are more polar than bonds between sulfur and oxygen. nevertheless, sulfur dioxide (SO₂) exhibits a dipole moment while carbon dioxide (CO₂) does not.

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3 years ago