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Grade 9 Atoms & Elements Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Chemistry

Unit 2: Atoms & the Periodic TableAtoms & ElementsNGSS 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 9 · Chemistry

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Name

Class

Date

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

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

Example

Which particle in an atom has a negative charge?

Answer: the electron

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. 5What number on the periodic table tells you the number of protons?
  2. 6What do we call a substance made of only one type of atom?
  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 no charge?
  • AElement
  • BIsotopes
  • CIn the nucleus
  • DAtomic number
  • ENeutron
Part C

Answer each question. Use full sentences where you can.

  1. 10

    What is the mass number of an atom?

  2. 11

    Where are electrons found in an atom?

  3. 12

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

  4. 13

    Why is a neutral atom uncharged overall?

  5. 14

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

  6. 15

    What are the three main particles found in an atom?

  7. 16

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

★ 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/9/chemistry_atoms

Answer key (click to show)
  1. 1.nucleus
  2. 2.proton
  3. 3.neutron
  4. 4.electron
  5. 5.D — the atomic number
  6. 6.A — an element
  7. 7.B — isotopes
  8. 8.C — in the nucleus
  9. 9.E — the neutron
  10. 10.the number of protons plus neutrons
  11. 11.in shells (energy levels) around the nucleus
  12. 12.12
  13. 13.it has the same number of protons and electrons
  14. 14.8
  15. 15.protons, neutrons, and electrons
  16. 16.12
  17. ★water vapor in your breath condenses on the cold glass (challenge corner)

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