Atomic Number and Mass Number
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Questions and Answers

What is the atomic number defined by?

  • Number of protons and electrons
  • Number of protons and neutrons
  • Number of protons (correct)
  • Number of neutrons and electrons

How is the mass number of a single atom calculated?

  • Protons / Neutrons
  • Protons - Neutrons
  • Protons + Neutrons (correct)
  • Protons x Neutrons

Which subatomic particle is essentially without mass?

  • Protons
  • Electrons (correct)
  • Neutrons
  • Positrons

What is the common factor among all atoms of the same element?

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

How are protons and electrons distinguished in terms of charge?

<p>+1 charge for protons and -1 charge for electrons (A)</p> Signup and view all the answers

What is the charge of a neutron?

<p>0 (C)</p> Signup and view all the answers

How can one determine the atomic number of an element?

<p>By looking at the periodic table (D)</p> Signup and view all the answers

What is the relationship between isotopes and mass numbers?

<p>Isotopes have different mass numbers (C)</p> Signup and view all the answers

How is the mass number of an atom calculated?

<p>A = Protons + Neutrons (D)</p> Signup and view all the answers

Which element has 14 protons and 15 neutrons in a specific isotope?

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

What does the mass number of an element represent?

<p>The number of protons + neutrons in an atom of the element (A)</p> Signup and view all the answers

How can one calculate the number of neutrons in an atom if given the atomic and mass numbers?

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

Which statement is true about atomic and mass numbers?

<p>Atomic numbers are unique to each element, while mass numbers vary for different isotopes. (B)</p> Signup and view all the answers

What is the relationship between atomic and mass numbers?

<p>Atomic number is the number of protons, while the mass number is protons + neutrons. (A)</p> Signup and view all the answers

What distinguishes atomic number from mass number in terms of elements?

<p>Atomic number is automatically known from the element's identity, while mass number must be determined based on neutrons. (D)</p> Signup and view all the answers

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