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Grade 10 Atomic Structure & Isotopes Worksheet with Answers

Grade 10 (US) · Year 11 (UK) · Class 10 (India) · Science

Unit 1: Atomic StructureAtoms & IsotopesNGSS HS-PS1-1

Finding protons, neutrons and electrons from atomic number, mass number and charge. This free high school worksheet has 16 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Atomic Structure & Isotopes

Grade 10 · Science

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Class

Date

Learning goal: Atoms & Isotopes · NGSS HS-PS1-1

Directions: This worksheet has 2 parts. Read the instructions at the start of each part.

Example

How many protons does an atom of potassium (K, atomic number 19) have?

Answer: 19

Part A

Label the diagram. Use the words in the box.

Word bank

protonnucleusneutronelectron
+++−−−−−−−−1234
  1. 1
  2. 2
  3. 3
  4. 4
Part B

Answer each question. Use full sentences where you can.

  1. 5

    An isotope of carbon (atomic number 6) has a mass number of 13. How many protons and neutrons does it have?

  2. 6

    How many protons does an atom of argon (Ar, atomic number 18) have?

  3. 7

    An isotope of phosphorus (atomic number 15) has a mass number of 33. How many protons and neutrons does it have?

  4. 8

    Nitrogen-14 has atomic number 7. How many neutrons does it have?

  5. 9

    How many protons does an atom of sulfur (S, atomic number 16) have?

  6. 10

    Magnesium-24 has atomic number 12. How many neutrons does it have?

  7. 11

    How many protons does an atom of beryllium (Be, atomic number 4) have?

  8. 12

    How many protons does an atom of aluminum (Al, atomic number 13) have?

  9. 13

    How many protons does an atom of boron (B, atomic number 5) have?

  10. 14

    Silicon-28 has atomic number 14. How many neutrons does it have?

  11. 15

    Calcium-40 has atomic number 20. How many neutrons does it have?

  12. 16

    An isotope of oxygen (atomic number 8) has a mass number of 17. How many protons and neutrons does it have?

★ Challenge corner for fast finishers

If Earth stopped spinning, how long would one day (sunrise to sunrise) be?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/10/atomic_structure

Answer key (click to show)
  1. 1.nucleus
  2. 2.proton
  3. 3.neutron
  4. 4.electron
  5. 5.6 protons, 7 neutrons
  6. 6.18
  7. 7.15 protons, 18 neutrons
  8. 8.7
  9. 9.16
  10. 10.12
  11. 11.4
  12. 12.13
  13. 13.5
  14. 14.14
  15. 15.20
  16. 16.8 protons, 9 neutrons
  17. ★about one year (challenge corner)

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