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Worksheet: Atomic and Mass Numbers

Q1:

An atom of chlorine has a mass number of 35. What is the total number of protons and neutrons in its nucleus?

Q2:

An atom of sulfur has 16 protons in its nucleus. What is the atomic number of sulfur?

Q3:

An aluminum atom has an atomic number of 13 and a mass number of 27.

How many protons are there in an atom of aluminum?

How many neutrons are there in an atom of aluminum?

How many electrons are there in an atom of aluminum?

Q4:

A carbon atom has an atomic number of 6 and a mass number of 12.

How many protons are there in an atom of carbon?

How many neutrons are there in an atom of carbon?

How many electrons are there in an atom of carbon?

Q5:

An ion has atomic number 29, mass number 65 and a charge of 2+.

How many protons does the ion contain?

How many neutrons does the ion contain?

How many electrons does the ion contain?

What is the chemical symbol for this element?

  • A C u
  • B T b
  • C C o
  • D K r
  • E G a

Q6:

An atom of sodium has a mass number of 23. What is the total number of protons and neutrons in the nucleus of the atom?

Q7:

An atom of silicon has an atomic number of 14. How many electrons are there in an atom of silicon?

Q8:

Neon has an atomic number of 10. How many protons are there in an atom of neon?

Q9:

An ion has atomic number 17, mass number 37 and a charge of 1 .

How many protons does the ion contain?

How many neutrons does the ion contain?

How many electrons does the isotope contain?

What is the chemical symbol for this element?

  • A C l
  • B R b
  • C A r
  • D S
  • E C a

Q10:

An ion has atomic number 50, mass number 116 and a charge of 4+.

How many protons does the ion contain?

How many neutrons does the ion contain?

How many electrons does the ion contain?

What is the chemical symbol for this element?

  • A S n
  • B P d
  • C D y
  • D X e
  • E L v

Q11:

Phosphorus-33 has an atomic number of 15. How many neutrons are there in an atom of phosphorus-33?

Q12:

A fluorine atom has an atomic number of 9 and a mass number of 19.

How many protons are there in an atom of fluorine?

How many neutrons are there in an atom of fluorine?

How many electrons are there in an atom of fluorine?

Q13:

An atom of calcium has a mass number of 42 and an atomic number of 20. How many neutrons are there in its nucleus?

Q14:

The atomic number of helium-4 is half its mass number. How many neutrons are there in an atom of helium-4?