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givi [52]
3 years ago
14

Which of these statements about half-life is true? Check all that apply. Half-lives vary dramatically from isotope to isotope. A

relationship exists between isotopes and half-lives. Half-lives are constant for a particular isotope. Half-life is an exact measure of when individual atoms will decay. Temperature, pressure, and density affect the half-life of an isotope.​
Chemistry
1 answer:
juin [17]3 years ago
7 0

Answer:A,C

Explanation:

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Which of the following series of isoelectronic ions (Mg²⁺, N³⁻, F⁻, Si⁴⁺) has the ionic radii in order of largest to smallest? A
Rom4ik [11]

Answer:

Option (d) is correct

N³⁻ > F⁻ > Mg²⁺ > Si⁴⁺

Explanation:

Total electrons for all the species = 10

So these are <u>iso electronic</u> with each other.

We know

Ionic radii ∝ \frac{Magnitude of Negative Charge}{Magnitude of Positive Charge}

  • Si⁴⁺ has 14 protons and 10 electrons
  • Mg²⁺ has 12 protons and 10 electrons
  • N³⁻ has 7 protons and 10 electrons
  • F⁻ has 9 protons and 10 electrons
  • Iso electronic species with greatest number of protons have small size and vice versa.
  • So Si⁺⁴ have smallest size and N³⁻ have largest in size
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Tema [17]

Answer:

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Explanation:

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The more the salt ionizes, the more there is ion-dipole interaction between the ions the solvent and more is the solubility.

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Lead IV oxide decompose to give lead ll oxide and oxygen. Lead iv oxide is thermally unstable and it usually decomposes into oxygen and lead ll oxide when heated. Lead ll oxide is more stable than lead lV oxide.
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