Chemistry, 10.07.2019 06:30 xojade

Acertain radioactive atom has 90 protons and 142 neutrons. if this atom undergoes alpha decay, what is the mass number of the daughter atom? the mass number of the daughter atom is .

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Answer from: thicklooney

the mass number of the daugther atom is 232,

Explanation:

1) Alpha (α) decay is a nuclear reaction in which a nucleus (parent's nucleus) emits an alpha (α) particle and leads to a different atom (daughter atom).

2) The alpha (α) particle is a nucleus of helium atom, i,e, a nucleus with two protons and two neutrons. The symbol used for the α particles is ⁴₂He, where the superscript 4 indicates the mass number (2 protons + 2 neutrons = mass number 4), and the subscript 2 indicates the atomic number (number of protons).

3) Then, to determine the mass number of the daughter atom you just need to do a mass number balance:

mass number of the parent atom = mass number of the daugther atom + mass number of the α particle.

The mass number of the radioactive (parent) atom is 90 protons + 142 neutrons = 232.

∴ 232 = x + 4 ⇒ x = 232 - 4 = 228 ← answer.

The full equation may help you to have a wider vision of the problem:

²³²₉₀ X → ⁴₂ He + ²²⁸₈₈ Y

Note this:

232 = 4 + 228 (this is a mass number balance)90 = 2 + 88 (this is an atomic number balance)X is the parent atom, and Y is the daughter atomYou can use a periodic table to determine the identity of the unknown atoms (using the atomic numbers).

Answer from: joshhowze1896

The mass number of daughter atom is 228.

Explanation:As the mass number is the total number of protons and neutrons in an atom, So initial mass number will be 90 + 142 = 232.As the alpha particles are helium nuclei having mass number of 4.So after eliminating alpha particles, the mass number will lower by 4.Mass number of daughter atom = 232 - 4 = 228

Answer from: Quest

yes it is balanced

Answer from: Quest

For cyclohexane compounds drawn in a chair conformation: -axial bonds are vertical -equatorial bonds are parallel to two bonds within the ring. thus, as i assume the chair conformation is drawn: -the x group is in an axial position, as are the five other vertical bonds. -three axial bonds are on the top face of the ring -the other three axial bonds are on the bottom face the position of the second substituent on each ring carbon is equatorial. gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other. drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1. click this link and watch some academic videos that may you more understand the topic

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Acertain radioactive atom has 90 protons and 142 neutrons. if this atom undergoes alpha decay, what...

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