An Atom of ²³⁵U (Z = 92)disintegrates to ²⁰⁷Pb (Z $\beta$

question 19

Multiple Choice

An atom of ²³⁵U (Z = 92) disintegrates to ²⁰⁷Pb (Z = 82) with a half-life of about a billion years by emitting seven alpha particles and ______ $\beta$ ^- particles:

• A)3
• B)4
• C)5
• D)6
• E)7

Understand the relationship between atomic structure and chemical properties.

Differentiate among types of chemical bonds and molecular interactions.

Explain the properties of water and its significance to living organisms.

Describe the characteristics of strong and weak acids and bases.

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Definitions:

High Blood Pressure

A condition where the force of the blood against the artery walls is too high, often leading to health risks.

Treatment Group

In an experimental study, the group that receives the treatment or condition being tested, as opposed to the control group.

Control Group

A group in an experiment or study that does not receive treatment by the researchers and is then used as a benchmark to measure how the other tested subjects do.

Confidence Interval

A range of values, derived from sample statistics, that is likely to contain the value of an unknown population parameter, with a certain level of confidence.