Nurse Cheung - Chemistry 87 questions

1) Question: Positively charged particles are called what?
Answer: Protons.
Brief explanation: Protons are in the nucleus and determine the element.

2) Question: Particles with neutral electrical charge are called what?
Answer: Neutrons.
Brief explanation: Neutrons add mass and create isotopes.

3) Question: Negatively charged particles are called what?
Answer: Electrons.
Brief explanation: Electrons are involved in bonding and chemical reactions.

4) Question: Where are protons located?
Answer: In the nucleus (center of the atom).
Brief explanation: The nucleus holds the heavy particles (protons + neutrons).

5) Question: Where are neutrons located?
Answer: In the nucleus.
Brief explanation: They stay packed with protons in the center.

6) Question: Where are electrons located?
Answer: They orbit around the nucleus.
Brief explanation: They occupy regions (energy levels) around the nucleus.

7) Question: What is the atomic number?
Answer: The number of protons in an atom.
Brief explanation: Atomic number = the element’s “ID.”

8) Question: What is atomic mass?
Answer: # protons + # neutrons.
Brief explanation: Most mass comes from the nucleus.

9) Question: How do you find the number of neutrons?
Answer: Mass number − number of protons.
Brief explanation: Neutrons are what’s left when you remove protons from mass.

10) Question: How do you find overall AMU (as listed)?
Answer: Protons + neutrons.
Brief explanation: Same idea as atomic mass count in this guide.