Periodic Table Basics
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Questions and Answers

What is the total number of known elements?

  • 100
  • 125
  • 118 (correct)
  • 120
  • What determines the classification of elements as metals, nonmetals, or metalloids?

  • Atomic number
  • Their properties (correct)
  • Atomic mass
  • Their electron shells
  • How do the atomic radius and atomic mass of elements change when moving from left to right across a period?

  • Atomic radius increases, atomic mass decreases
  • Atomic radius and atomic mass both increase
  • Atomic radius and atomic mass both decrease
  • Atomic radius decreases, atomic mass increases (correct)
  • What is the main difference between periods and groups in the periodic table?

    <p>Periods are horizontal, groups are vertical</p> Signup and view all the answers

    What do elements in the same group have in common?

    <p>The same number of electrons in their outermost energy level</p> Signup and view all the answers

    How do the atomic number and atomic mass of elements change when moving down a group?

    <p>Atomic number and atomic mass both increase</p> Signup and view all the answers

    Study Notes

    Elements

    • A periodic table is composed of elements, which are the building blocks of matter.
    • There are 118 known elements, each with a unique atomic number (number of protons in the nucleus) and atomic mass (total number of protons and neutrons).
    • Elements are represented by a one- or two-letter symbol, known as the elemental symbol.
    • Elements can be classified as metals, nonmetals, or metalloids based on their properties.

    Periods

    • The periodic table is arranged in periods, which are horizontal rows.
    • There are 7 periods in the periodic table, each representing a new energy level.
    • Elements in the same period exhibit similar trends in physical and chemical properties due to the same number of electron shells.
    • Moving from left to right across a period, the elements exhibit increasing atomic number, increasing atomic mass, and decreasing atomic radius.

    Groups

    • The periodic table is also arranged in groups, which are vertical columns.
    • There are 18 groups in the periodic table, each representing a new family of elements.
    • Elements in the same group exhibit similar chemical properties due to the same number of electrons in their outermost energy level.
    • Moving down a group, the elements exhibit increasing atomic number, increasing atomic mass, and increasing atomic radius.

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    Learn about the elements, periods, and groups of the periodic table, including their properties and classification. Understand the basics of atomic number, atomic mass, and electron shells. Test your knowledge of the periodic table!

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