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Archy [21]
3 years ago
9

Positrons are spontaneously emitted from the nuclei of

Chemistry
2 answers:
Fudgin [204]3 years ago
6 0

Answer: Option (1) is the correct answer.

Explanation:

  • A positron is a small particle which contains a +1 charge and its mass is equal to the mass of an electron, that is, 9.109 \times 10^{-31} kg.

A positron is represent by the symbol ^{0}_{+1}\beta.

For example, ^{37}_{19}K \rightarrow ^{37}_{18}Ar + ^{0}_{+1}\beta

  • Whereas nitrogen-16 does not decay to give a positron because nitrogen-16 is the daughter isotope formed due to decay of oxygen-16.

The decay reaction is as follows.

           ^{16}_{8}O \rightarrow ^{16}_{7}N + ^{0}_{+1}\beta

  • And, on radioactive decay of thorium-232 there will be formation of radium-228 along with emission of an alpha particle.

The reaction will be as follows.

            ^{232}_{90}Th \rightarrow ^{228}_{88}Ra + ^{4}_{2}\alpha

Therefore, we can conclude that out of the given options positrons are spontaneously emitted from the nuclei of potassium-37.

Leto [7]3 years ago
4 0
Positrons are spontaneously emitted from the nuclei of potassium -37.
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Option "A"  is the correct answer.

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What is a Pure element ?
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A substance where almost all have the same atomic number of protons
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How many grams of water can be produced in the combination of
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If 14 grams of hydrogen reacted with 24.7 grams of oxygen 27.7875 grams of water will be formed.

Explanation:

2H2+O2----------->2H2O.

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Which part of the plant carries water and food to and from the leaves?
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List the substances Ar, Cl2, CH4, and CH3COOH, in order of increasing strength of intermolecular attractions. List the substance
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Answer:

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Explanation:

CH_3COOH can form hydrogen bond as H atom is attached with electronegative atom O.

Rest three, Cl_2,  CH_4,  Ar are non-polar molecules.

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van der Waals intermolecular forces of attraction increases with increase in size.

Therefore,

Order of increasing strength of intermolecular attraction will be:

CH_3COOH > Cl_2 > CH_4 > Ar

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