A 450-Mg Sample of a Newly Discovered Radioactive Nuclide Was Analyzed

question 17

Multiple Choice

A 4.50-mg sample of a newly discovered radioactive nuclide was analyzed and found to contain only 3.25 mg after a period of 30.3 h.What is the half-life of the nuclide?

• A) 76.3 h
• B) 64.5 h
• C) 73.8 h
• D) 11.1 h
• E) 17.6 h

---

Definitions:

Neuroticism

A pattern in someone's behavior identified by nervousness, trepidation, instability in emotions, apprehensiveness, covetousness, exasperation, rivalry, and being solitary.

Conscientiousness

A personality trait marked by thoroughness, carefulness, and the propensity to plan and organize tasks effectively.

Serotonin

A neurotransmitter that has a key role in stabilizing mood, feelings of well-being, and happiness, as well as impacting various body functions including the regulation of sleep.

Impulsivity

A personality trait characterized by the tendency to act on a whim, displaying behavior without adequate thought or consideration of the consequences.