Proton Discovery and Properties
10 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What did Rutherford discover in 1919?

  • Helium nuclei form when alpha particles strike some of the lighter elements
  • Neutrons form when alpha particles strike some of the lighter elements
  • Protons form when alpha particles strike some of the lighter elements (correct)
  • Electrons form when alpha particles strike some of the lighter elements

    • What is the mass of a proton?

  • $1.674927 × 10-27 kg$
  • $5.485799 × 10-4 kg$
  • $1.67262 × 10-24 kg$ (correct)
  • $9.109383 × 10-31 kg$

    • What is the actual charge of a neutron?

  • $5.485799 × 10-4 C$
  • $0 C$ (correct)
  • $1.602 × 10-19 C$
  • $-1.602 × 10-19 C$

    • What does the atomic number (Z) of an element represent?

    <p>Number of protons in the nucleus</p> Signup and view all the answers

    What is the total number of protons and neutrons in the nucleus of an atom?

    <p>$A$</p> Signup and view all the answers

    What is an isotope of an element?

    <p>An isotope has different numbers of neutrons and the same mass number</p> Signup and view all the answers

    What does the atomic mass of an element represent?

    <p>The average mass of all isotopes of the element</p> Signup and view all the answers

    Why are all atoms of an element identical in atomic number?

    <p>Because they have the same number of protons</p> Signup and view all the answers

    What determines the average relative atomic mass (A) of an element?

    <p>The relative masses of the isotopes weighted by their observed fractional abundances</p> Signup and view all the answers

    Which term describes atoms with different numbers of neutrons but the same atomic number?

    <p>Isotopes</p> Signup and view all the answers

    Study Notes

    Rutherford's Discovery

    • In 1919, Rutherford discovered the proton, a positively charged particle in the atomic nucleus.

    Subatomic Particles

    • The mass of a proton is approximately 1 atomic mass unit (amu).
    • A neutron has no actual charge, being electrically neutral.

    Atomic Number and Atomic Mass

    • The atomic number (Z) of an element represents the number of protons in the nucleus of an atom.
    • The total number of protons and neutrons in the nucleus of an atom is known as the mass number (A).
    • The atomic mass of an element represents the total mass of protons and neutrons in the nucleus of an atom.
    • The atomic mass is usually a weighted average of the masses of the naturally occurring isotopes of an element.

    Isotopes and Atomic Number

    • An isotope of an element is a variant of the element with a different number of neutrons in the nucleus, but the same atomic number (Z).
    • All atoms of an element are identical in atomic number because they have the same number of protons in the nucleus.
    • The average relative atomic mass (A) of an element is determined by the relative abundance of its isotopes.

    Isotopes and Atomic Mass

    • Atoms with different numbers of neutrons but the same atomic number are referred to as isotopes of an element.
    • The term "isotope" is used to describe these variations in atomic mass due to differing neutron counts.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Explore the discovery and properties of protons, including their formation from alpha particles, positive charge, mass in comparison to electrons, and contribution to the positive charge of a nucleus.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser