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In-s [12.5K]
2 years ago
11

Which isoelectronic series is correctly arranged in order of increasing radius?.

Chemistry
1 answer:
Ket [755]2 years ago
4 0

A) K+ < Ca2+ < Ar < Cl

B) < Ar < K+ < Ca2+

C) Ca2+ < Ar < K+ < Cl

D) Ca2+ < K+ < Ar < Cl

E) Ca2+ < K+ < Cl- < Ar

Answer:D

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Express the frequency in inverse seconds. n=4--&gt;n=3. Can you please tell me what formulas to use, because I have like 6 more
bulgar [2K]

Answer:

  • 1.60×10¹⁴ s⁻¹

Explanation:

When an electron jumps from one energy level to a lower energy level some energy is released in the form of a photon.

The difference in energy between the two levels is the energy of the photon and that energy is related to the frequency of the photon by the Einstein - Planck equation:

  • E = hν

Where,

  • E = energy of the photon,
  • h = 6.626×10⁻³⁴ J.s, Planck constant, and
  • ν = frequency of the photon.

So, to find the frequency you must first find the energy.

The transition energy can be calculated using the formula:

  • Eₙ = - E₀ ( 1/ n²)

Where E₀ = 13.6 eV ( 1 eV = 1.602×10⁻¹⁹ Joules) and n = 1,2,3,...

So, the transition energy between n = 4 and n = 3 will be:

  • ΔE = - E₀ [ 1/4² - 1/3²] = - 13.6 eV [1/16 - 1/9] = 0.6611. . .eV

  • ΔE = 1.602×10⁻¹⁹ Joules/eV  × 0.6611... eV = 1.0591 ×10⁻¹⁹ Joules

Now you can use the Einstein - Planck equation:

  • E = hν
  • ν = E / h
  • ν = 1.0591 ×10⁻¹⁹ J / 6.626×10⁻³⁴ J.s  = 1.60×10¹⁴ s⁻¹ (rounded to 3 significant figures).
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Answer:

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Explanation:

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Explanation:

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If the equilibrium of a weak acid dissociation reaction is upset, the equilibrium will shift to balance the change as explained by Le Chatelier's principle.

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What causes an object to have a positive charge?
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The attraction between protons and electrons holds particles together. An electric charge can be either positive or negative. A positive electrical charge is called a proton. ... When an object loses electrons, it has a shortage of electrons, it has a shortage of electrons and is said to have a positive charge.
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