PracticeQuiz content is free on an ad-supported model.

Unfortunately, we can't support ad blocker usage because of the impact on our servers. If you'd like to continue, please disable your ad blocker and reload page.

Reload page

Praxis II: Chemistry Exam Prep

Category - Chemistry

Start a Study Session Sign up for Question of the Day

A neutral element has a mass number of 129 and 75 neutrons. What is the identity of this element?

Copper
Tungsten
Rhenium
Uranium
Xenon

Explanation

Answer: Xenon

The mass number of an element is the number of protons and neutrons in an atom of that element. Subtracting the number of neutrons present from the mass number gives the atomic number. Such a calculation indicates that the unknown in this question is xenon.

Previous Next

Was this helpful? Upvote!

Start a Study Session Sign up for Question of the Day

Most popular on PracticeQuiz

219 votes

You are attempting to gather information from a patient, but they are having a hard time trying to communicate since they were hit in the throat by a baseball bat. What is the function of the vocal cords? NREMT Advanced EMT
209 votes

An 8-year-old boy named Albert has a 10-year-old brother named Benny. Benny joins the service at 20 leaving Albert feeling bitter that he no longer has a brother to look up to. After 7 years, Albert is finally ready to make up with Benny who has been out of the service for 5 years. How old is Albert now? GED Exam Prep: Math
186 votes

Using motivation from ‘within’ is called ______________. CPCE Exam Prep
177 votes

The lymphatic system contains four organs: Medical Coding Exam Prep
127 votes

“A set of specialized organizational capabilities for providing value to customers in the form of services” is the official definition of: IT Service Management Foundation Practice Test

Praxis II: Chemistry Exam Prep

Top questions

Related questions

Most popular on PracticeQuiz

Ad-Blocker not supported

Praxis II: Chemistry Exam Prep

Top questions

Related questions

Most popular on PracticeQuiz