Worksheet: Isotopes

In this worksheet, we will practice working out the number of protons, neutrons, and electrons an atom of an isotope has from its chemical symbol.

Q1:

An uncharged atom has an atomic number of 6 and a mass number of 11.

How many protons does that atom have?

How many neutrons does that atom have?

How many electrons does that atom have?

Q2:

A platinum atom has the chemical symbol 1 9 5 7 8 P t .

How many protons does the platinum atom have?

How many neutrons does the platinum atom have?

Q3:

The chemical element symbol for titanium-48 is 4 8 2 2 T i .

What is the atomic number of titanium?

What is the mass number of titanium?

Q4:

Two atoms are different isotopes of the same element if they have the same but different .

  • Anumber of protons, numbers of electrons
  • Bmass number, atomic numbers
  • Cnumber of neutrons, numbers of electrons
  • Datomic number, mass numbers
  • Enumber of electrons, numbers of protons

Q5:

All atoms of the same element have the same number of .

  • Aneutrons
  • Belectrons
  • Cprotons

Q6:

A nitrogen atom has the chemical symbol 1 4 7 N .

How many protons does the nitrogen atom have?

How many neutrons does the nitrogen atom have?

Q7:

The mass number of an atom is how many it has.

  • Aprotons
  • Bneutrons
  • Cprotons plus electrons
  • Dprotons plus neutrons
  • Eelectrons

Q8:

A neon atom has the chemical symbol 2 2 1 0 N e .

How many protons does the neon atom have?

How many neutrons does the neon atom have?

Q9:

Which of the following is another name for “atomic number?”

  • ANucleon number
  • BMass number
  • CElectron number
  • DProton number
  • ENeutron number

Q10:

The atomic number of an atom is how many it has.

  • Aelectrons
  • Bneutrons
  • Cprotons plus neutrons
  • Dprotons
  • Eprotons plus electrons

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