10 minutes maximum! Can you do it in 5?

 1. Which particles are in the centre of an atom?

  • A. protons and electrons.
  • B. neutrons and electrons.
  • C. neutrons and protons.
  • D. protons, neutrons and electrons.

2. What is the name of the centre part of an atom, and what orbits around this?

 Centre part In orbit
A
 nucleus protons
B
 nucleole electrons
C
 nucleus electrons
D
 nucleole protons

 

Q3-6. Which of these particles....

  

3. ..has a negative charge.

4. ..has a mass of 1 atomic unit and a positive charge.

5. ..has a neutral charge.

Here is a diagram of an atom of Beryllium.

It has the symbol:

 

 diagram of a beryllium atom

6. What does the top number represent?

  • A. The number of protons.
  • B. The number of protons plus electrons.
  • C. The number of neutrons.
  • D. The total mass of the nucleus.

 

7. What does the bottom number represent?

  • A. The number of protons.
  • B. The number of protons plus electrons.
  • C. The number of neutrons.
  • D. The total mass of the nucleus.

 

8-10: Strontium isotopes:

The symbol for the radioactive isotope strontium-90 is shown here.

strontium symbol periodic table

8. How many protons (p) and neutrons (n) does it have?

  • A. 90 p, 90 n
  • B. 38 p, 90 n
  • C. 52 p, 38 n
  • D. 38 p, 52 n

9. Two different isotopes will have...

  • A. the same number of protons but a different number of neutrons.
  • B. the same number of neutrons but a different number of protons.
  • C. the same number of protons but a different number of electrons.
  • D. the same number of electrons but a different number of protons.

10. Question 8 descibes an isotope of strontium. Which of these describes the nucleus of a different isotope of strontium?

  • A. 90 p, 91 n
  • B. 39 p, 52 n
  • C. 38 p, 53 n
  • D. 53 p, 38 n