When a Radioactive Isotope Decays by Electron Capture,the Electron ________

question 47

Multiple Choice

When a radioactive isotope decays by electron capture,the electron ________.

• A)combines with a neutron in the nucleus,raising the mass number of the daughter isotope by one
• B)combines with a proton in the nucleus; the atomic number of the daughter is one less than the parent
• C)makes the parent isotope into an ion with a charge of negative one
• D)makes the daughter isotope into an ion with a charge of positive one

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Definitions:

Down Syndrome

A genetic disorder caused by the presence of all or part of a third copy of chromosome 21, characterized by developmental delays and distinctive physical features.

Nondisjunction

An error in cell division that results in daughter cells with an incorrect number of chromosomes, leading to genetic disorders such as Down syndrome.

Chromosome 21

One of the 23 pairs of chromosomes in humans, with Down syndrome resulting from an extra copy of this chromosome.

Monosomy

Chromosome condition in which a diploid cell has one less chromosome than normal; designated as 2n − 1.