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4 years ago

Orbitals which valence electrons are found for calcium

1 answer:

galina1969 [7]4 years ago

8 0

The 4th energy level (row), 's' orbital block, 2nd group (column). The valence electrons are found in the highest energy level of the electron configuration in the 's' and 'p' orbitals. In the case of calcium this is 4s2 . This gives calcium an 's' orbital with a pair of electrons in its valence shell

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For some hypothetical metal, the equilibrium number of vacancies at 900c is 2.3 1025 m3. if the density and atomic weight of thi

PSYCHO15rus [73]

Hey there!

The number of vacancies per unit volume => ( Nv = 2.3*10²⁵ m⁻³ )

Avogrado's number => ( NA = 6.022*10²³ atoms/mol )

Density of material ( p ) in g/m³ :

1 g/cm³ = 1000000 g/m³ so:

7.40 * ( 1000000 ) = 7.40*10⁶ g/m³

Atomic mass = 85.5 g/mol

* Calculate the number of atomic sites per unit volume :

N = NA * p / A

N = ( 6.022*10²³ ) * ( 7.40*10⁶ ) / 85.5

N = 4.45*10³⁰ / 85.5

N = 5.212*10²⁸ atoms/m³

Therefore:

Calculate the fraction of vacancies :

Fv = Nv / N

Fv = 2.3*10²⁵ / 5.212*10²⁸

FV = 4.441*10⁻⁴

Hope that helps!

5 0

3 years ago

For an aqueous solution of sucrose (C12H22O11), determine: (a) the molarity of 3.30 L of a solution that contains 225.0 g of suc

dusya [7]

Answer:

a) Molarity = 0.199M

b) 21.6L of solution

c) 0.199 moles of sucrose in 1L

Explanation:

a) Molarity is the ratio of moles of solute (sucrose) in volume of solution (3.30L):

<em>Moles sucrose -Molar mass: 342,3g/mol-:</em>

225.0g * (1mol / 342,2965g) = 0.6573 moles

Molarity = 0.6573 moles / 3.30L

<h3>Molarity = 0.199M</h3><h3 />

b) 0.199M means 0.199 moles in 1L. 4.30 moles are in:

4.30 mol * (1L / 0.199mol) = 21.6L of solution

c) By definition, there are 0.199 moles of sucrose in 1L. This is the meaning of 0.199M

8 0

3 years ago

The prefix centi- means

olya-2409 [2.1K]

100. Centi means a hundred.

5 0

3 years ago

Read 2 more answers

The diagram to the right shows energy for two reactions, A and B. Which reaction has the higher Gpx?.Which reaction has the high

Georgia [21]

Answer:

They are the same.

Reaction B has a higher activation energy

Reaction A will most likely proceed faster

5 0

4 years ago

Read 2 more answers

In the quantum theory, the magnetic orbital momentum quantum number is most directly associated with which property of orbitals?

kolezko [41]

Answer: In the quantum theory, the magnetic orbital momentum quantum number is most directly associated with orientation of orbitals

In the quantum theory, angular orbital momentum quantum number is most directly associated with shape of orbitals.

Explanation:

Principle Quantum Number : It describes the size of the orbital and the energy level. It is represented by n. Where, n = 1,2,3,4....

Angular orbital momentum quantum number or Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as $m_l$ . The value of this quantum number ranges from $(-l\text{ to }+l)$ . When l = 2, the value of $m_l$ will be -2, -1, 0, +1, +2.

Spin Quantum number : It describes the direction of electron spin. This is represented as $m_s$ The value of this is $+\frac{1}{2}$ for upward spin and $-\frac{1}{2}$ for downward spin.

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3 years ago