Atomic Fundamentals

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Questions and Answers

Which one of these is true about atoms?

  • Atoms are the smallest part and building block of elements
  • Atoms are made up of neutrons, protons, and electrons
  • Atoms have the same number of protons and electrons
  • All of the above (correct)

What are neutrons and protons?

  • Neutrons and protons are located in the nucleus of an atom (correct)
  • Neutrons and protons revolve around the nucleus in an orbital
  • Neutrons and protons have a positive charge
  • Neutrons and protons are elementary particles

What is the charge of an electron?

  • Positive (+)
  • Negative (+) (correct)
  • Neutral
  • None of the above

What is the mass of an electron relative to a proton?

<p>0.0005 (C)</p> Signup and view all the answers

What is the atomic number of an element?

<p>The number of protons in an atom (C)</p> Signup and view all the answers

Which model of atoms was used until the early 1900s?

<p>The solid sphere model (D)</p> Signup and view all the answers

What did the solid sphere model of atoms fail to explain?

<p>Chemical reactions (B)</p> Signup and view all the answers

What are the sub-atomic particles that make up an atom according to the new model?

<p>Protons, neutrons, and electrons (C)</p> Signup and view all the answers

Where are protons and neutrons located within an atom?

<p>In the nucleus (A)</p> Signup and view all the answers

Why are atoms electrically neutral?

<p>Because they have an equal number of protons and electrons (C)</p> Signup and view all the answers

Which of the following correctly describes the composition of an atom's nucleus?

<p>The nucleus is made up of protons and neutrons. (A)</p> Signup and view all the answers

What is the overall electric charge of an atom?

<p>Neutral (A)</p> Signup and view all the answers

Which of the following statements about the mass of an atom is true?

<p>The mass of an atom is concentrated in its nucleus. (B)</p> Signup and view all the answers

What is the atomic number of an arsenic atom?

<p>33 (D)</p> Signup and view all the answers

What did the early 1900s model of atoms fail to explain?

<p>Chemical reactions (B)</p> Signup and view all the answers

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