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Grade 10 Atoms & Elements Worksheet with Answers

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

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

Protons, neutrons and electrons, and how atoms make up elements. 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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Atoms & Elements

Grade 10 · Chemistry

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Name

Class

Date

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

Directions: This worksheet has 3 parts. Read the instructions at the start of each part.

Example

What are the three main particles found in an atom?

Answer: protons, neutrons, and electrons

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

Match each clue to the right word. Write the letter in the box.

  1. 5Which particle in an atom has a negative charge?
  2. 6What do we call an atom that has gained or lost electrons?
  3. 7What do we call atoms of the same element with different numbers of neutrons?
  4. 8Where are protons and neutrons located in an atom?
  5. 9Which particle in an atom has a positive charge?
  6. 10What do we call a substance made of only one type of atom?
  • AIon
  • BProton
  • CElement
  • DElectron
  • EIsotopes
  • FIn the nucleus
Part C

Answer each question. Use full sentences where you can.

  1. 11

    What is the mass number of an atom?

  2. 12

    A neutral atom has 8 protons. How many electrons does it have?

  3. 13

    An atom has 6 protons and 6 neutrons. What is its mass number?

  4. 14

    Where are electrons found in an atom?

  5. 15

    An atom has atomic number 11 and mass number 23. How many neutrons does it have?

  6. 16

    Why is a neutral atom uncharged overall?

★ Challenge corner for fast finishers

Why does your breath make fog on a cold window?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/chemistry/10/chemistry_atoms

Answer key (click to show)
  1. 1.nucleus
  2. 2.proton
  3. 3.neutron
  4. 4.electron
  5. 5.D — the electron
  6. 6.A — an ion
  7. 7.E — isotopes
  8. 8.F — in the nucleus
  9. 9.B — the proton
  10. 10.C — an element
  11. 11.the number of protons plus neutrons
  12. 12.8
  13. 13.12
  14. 14.in shells (energy levels) around the nucleus
  15. 15.12
  16. 16.it has the same number of protons and electrons
  17. ★water vapor in your breath condenses on the cold glass (challenge corner)

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