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Chapter 11: Problem 37

What is the difference between an \(\alpha\) particle and a helium atom?

Short Answer

Expert verified
An alpha particle is a helium nucleus without electrons, giving it a +2 charge, while a helium atom is neutral with two electrons.

Step by step solution

01

Understanding the Alpha Particle

An alpha particle is a type of particle emitted during radioactive decay. It consists of two protons and two neutrons, giving it a mass number of 4. Importantly, it carries a positive charge of +2, as it lacks electrons.
02

Understanding the Helium Atom

A helium atom also has two protons and two neutrons in its nucleus, the same as an alpha particle. However, unlike the alpha particle, a helium atom has two electrons that orbit the nucleus, making it electrically neutral overall.
03

Comparing Charge States

The critical difference lies in the charge. An alpha particle is positively charged with a +2 charge because of the absence of electrons, while a helium atom is neutral due to the presence of two electrons that balance out the positive charge of the protons.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Helium Atom
A helium atom is one of the simplest and most abundant types of atoms in the universe. Its nucleus contains two protons and two neutrons, similar to an alpha particle. However, what makes a helium atom unique is its two electrons that orbit around the nucleus. These electrons ensure that the positive charge of the protons is balanced, making the helium atom electrically neutral. Thanks to its stability and non-reactive nature, helium is often used in balloons and as a protective atmosphere for arc welding.
Furthermore, helium is lighter than air, which is why helium balloons float. When you think of neutral and stable, think of a helium atom.
Radioactive Decay
Radioactive decay is a fascinating process where an unstable atomic nucleus loses energy by emitting radiation. This emission can come in various forms, including alpha particles, beta particles, and gamma rays. Alpha decay is a type of radioactive decay where an unstable nucleus releases an \(\alpha\) particle, which consists of 2 protons and 2 neutrons.
This process decreases the original element's atomic number by two and mass number by four, resulting in a different, more stable element. Imagine it like a transformation, similar to a caterpillar becoming a butterfly, but in atomic terms, where the outcome is a new element.
Protons and Neutrons
Protons and neutrons are subatomic particles that reside in an atom's nucleus. Protons are positively charged, while neutrons are neutral with no electric charge. These particles make up most of the atom's mass.
  • Protons: The number of protons in an atom's nucleus defines the element. For example, helium always has two protons.
  • Neutrons: Although they don't affect the electric charge, neutrons add to the atomic mass and contribute to the stability of the nucleus.
The arrangement and number of these particles dictate the properties and stability of elements. Think of them as the building blocks providing structure and stability to atoms, much like bricks in a building.
Electric Charge
Electric charge is a fundamental property of particles that determines their electromagnetic interactions. There are two types of electric charge: positive and negative.
  • Positive charge: Carried by protons, it attracts negatively charged particles.
  • Negative charge: Carried by electrons, it attracts positively charged particles.
In the context of a helium atom and an alpha particle:
  • Helium atom: The two protons are balanced by two electrons, making the atom neutral.
  • Alpha particle: It lacks electrons, so its two protons give it a net positive charge of +2.
Understanding charge helps explain why particles interact the way they do, much like magnets attracting or repelling each other.

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Most popular questions from this chapter

Thorium-232 decays by a 10-step series, ultimately yielding lead-208. How many \(\alpha\) particles and how many \(\beta\) particles are emitted?

Describe how \(\alpha\) radiation, \(\beta\) radiation, \(\gamma\) radiation, positron emission, and electron capture differ.

What are transuranium elements, and how are they made? Are they stable or unstable?

One of the possible reactions for nuclear fusion involves the collision of 2 deuterium nuclei. Complete the reaction by identifying the missing particle:

Balance the fulluwing equations for the nuclear fission of \({ }_{92}^{235} \mathrm{U}\) : (a) \({ }_{92}^{235} \mathrm{U}+{ }_{0}^{1} \mathrm{n} \longrightarrow{ }_{62}^{160} \mathrm{Sm}+{ }_{30}^{72} \mathrm{Zn}+?{ }_{0}^{1} \mathrm{n}\) (b) \({ }_{92}^{235} \mathrm{U}+{ }_{0}^{1} \mathrm{n} \longrightarrow{ }_{35}^{87} \mathrm{Br}+?+3{ }_{0}^{1} \mathrm{n}\)
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