Ch. 2 The Chemistry of Life

Amerman - Human Anatomy & Physiology 2nd Edition

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Amerman 2nd Edition

Ch. 2 The Chemistry of Life

Problema L2.1

Capitolo 2, Problema L2.1

In certain types of radioactive decay, the isotope releases a particle called an alpha particle, which contains two protons and two neutrons. When this happens, is the product still the same element? Why or why not?

Guida verificata passo dopo passo

Step 1: Begin by understanding what an alpha particle is. An alpha particle consists of two protons and two neutrons, which means it has a mass number of 4 and a charge of +2.

Step 2: Recognize that when an isotope undergoes alpha decay, it loses an alpha particle. This results in a decrease in the atomic number (number of protons) by 2 and the mass number (total number of protons and neutrons) by 4.

Step 3: Recall that the atomic number determines the identity of an element. If the atomic number changes, the element itself changes because the number of protons defines the element.

Step 4: Use the periodic table to confirm that a decrease in atomic number by 2 means the element shifts to a different position on the table, corresponding to a new element.

Step 5: Conclude that the product of alpha decay is not the same element as the original isotope because the loss of two protons changes the atomic number, thereby changing the element's identity.

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Radioactive Decay

Radioactive decay is a process by which unstable atomic nuclei lose energy by emitting radiation. This can occur in various forms, including alpha decay, where an alpha particle (composed of two protons and two neutrons) is released. This process transforms the original element into a different element due to the loss of protons.

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Radioactive Isotopes

Alpha Particle

An alpha particle is a type of ionizing radiation consisting of two protons and two neutrons, essentially a helium nucleus. When an atom undergoes alpha decay, it emits this particle, resulting in a decrease in the atomic number of the original element by two. This change in atomic number is crucial for determining whether the product is the same element.

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Atomic Structure

Element Identity

The identity of an element is defined by its atomic number, which is the number of protons in its nucleus. When an element emits an alpha particle, it loses two protons, thus changing its atomic number and transforming it into a different element. Therefore, the product of alpha decay is not the same element as the original.

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Elements of Life

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