Atomic Numbers and Mass Numbers Quiz
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Questions and Answers

What is the atomic number of an atom?

  • The number of electrons
  • The sum of protons and neutrons
  • The number of neutrons
  • The number of protons (correct)

Which sub-atomic particle is not accounted for in the atomic number?

  • Electrons
  • Neutrons (correct)
  • Protons
  • Isotopes

What does the mass number represent in an atom?

  • The number of protons
  • The total number of sub-atomic particles
  • The sum of protons and neutrons (correct)
  • The number of electrons

Which element has an atomic number of 6 and a mass number of 12?

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

What does the notation 'A Z x' represent for an element?

<p>Atomic mass, atomic number, symbol (A)</p> Signup and view all the answers

Which of the following best describes a molecule of an element?

<p>Consists of only one type of atom (A)</p> Signup and view all the answers

What is the relationship between the mass number and the atomic number in an atom?

<p>Atomic number is less than the mass number (B)</p> Signup and view all the answers

Which sub-atomic particle has a charge but negligible mass?

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

What is the main difference between monoatomic and polyatomic molecules?

<p>Number of different types of atoms (C)</p> Signup and view all the answers

Which Greek philosopher first proposed the idea of 'atoms'?

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

What is the atomic number of an element?

<p>Number of protons only (A)</p> Signup and view all the answers

What is the relationship between the number of protons, electrons, and atomic number in an atom?

<p>Number of protons = Number of electrons = Atomic number (A)</p> Signup and view all the answers

Which subatomic particle is responsible for the mass of an atom?

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

How can you calculate the number of neutrons in an atom?

<p>Number of neutrons = Mass number - Atomic number (A)</p> Signup and view all the answers

In an atom with 8 protons, how many electrons are present?

<p>8 (A)</p> Signup and view all the answers

What is the relationship between the mass number and atomic number in an atom?

<p>Mass number &gt; Atomic number (B)</p> Signup and view all the answers

If an element has 6 protons and 6 neutrons, what is its atomic number?

<p>6 (C)</p> Signup and view all the answers

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