Chemistry Basics: Atoms and Elements
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Questions and Answers

What is the smallest particle that all matter is made of?

  • Molecule
  • Compound
  • Atom (correct)
  • Element

    • What is the charge of electrons in an atom?

  • Negative (correct)
  • Positive
  • Neutral
  • It varies

    • What is the maximum capacity of the 2nd electron shell?

  • 18
  • 32
  • 8 (correct)
  • 2

    • What is the term for the number of protons in the nucleus of an atom?

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

    What is the term for two or more different types of atoms bonded together?

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

    What is the symbol for silver?

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

    What is the purpose of the electron shells in an atom?

    <p>To orbit the nucleus and stabilize the atom</p> Signup and view all the answers

    What is a molecule composed of?

    <p>Different types of atoms bonded together</p> Signup and view all the answers

    What is the term for a substance composed of only one type of atom?

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

    What is the significance of the atomic number?

    <p>It determines the type of element</p> Signup and view all the answers

    What is the purpose of a chemical formula?

    <p>To show the number of atoms from each element in a compound</p> Signup and view all the answers

    What is the difference between a molecule of an element and a molecule of a compound?

    <p>The type of atoms bonded together</p> Signup and view all the answers

    What is the nucleus of an atom composed of?

    <p>Protons and neutrons</p> Signup and view all the answers

    What are the positively charged subatomic particles in an atom?

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

    What determines the identity of an element?

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

    What is the maximum capacity of the 1st electron shell?

    <p>2</p> Signup and view all the answers

    What is a molecule of CO2 an example of?

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

    What is the purpose of the Periodic Table?

    <p>To organize elements by their atomic number</p> Signup and view all the answers

    What is the formula for a molecule of water?

    <p>H2O</p> Signup and view all the answers

    What is the charge of neutrons in an atom?

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

    Study Notes

    Chemistry Basics

    • Atoms are the smallest particles that make up all matter, consisting of a nucleus (center) and electron shells (orbiting the nucleus).

    Atomic Structure

    • Atoms contain three subatomic particles: protons (positively charged), neutrons (neutral), and electrons (negatively charged).
    • Protons and neutrons are found in the nucleus, while electrons orbit the nucleus in electron shells.

    Electron Shells

    • Electron shells have a maximum electron capacity: 1st shell = 2, 2nd shell = 8, 3rd shell = 18 (stable at 8), 4th shell = 32.

    Elements

    • Elements consist of the same type of atom and are the building blocks of all substances.
    • Elements are listed in the Periodic Table in order of their atomic number (number of protons in the nucleus).
    • Each element has its own symbol, such as Hydrogen (H), Carbon (C), and Nitrogen (N).

    Molecules

    • A molecule is formed when two or more atoms are joined together by a chemical bond.
    • If the atoms are the same type, it's a molecule of an element (e.g., O2).
    • If the atoms are different, it's a molecule of a compound (e.g., CO2).

    Compounds

    • A compound is formed when two or more different types of atoms are bonded together.
    • Common examples of compounds include water (H2O), carbon dioxide (CO2), methane (CH4), and glucose (C6H12O6).
    • The formula of a compound indicates the number of atoms from each element present.

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    Chem for Grade 7.docx

    Description

    Learn about the building blocks of matter, atoms, and elements. This quiz covers the structure of atoms, including protons, neutrons, and electrons, and how they form elements. Test your knowledge of chemistry basics!

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