Understanding Elements in Science
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Questions and Answers

What is an element according to the text?

  • A mixture of different kinds of atoms
  • A compound made of multiple elements
  • A pure substance made of only one type of atom (correct)
  • A substance that can be broken down into other substances

    • Why is water not considered an element?

  • Because water is a mixture of different kinds of atoms
  • Because water can be broken down into other substances (correct)
  • Because water is a compound made of multiple elements
  • Because water is a pure substance made of only one type of atom

    • How are elements different from each other?

  • By the properties of the atoms they are made of (correct)
  • By their ability to mix with other types of atoms
  • By the number of subatomic particles within each atom
  • By the way they combine to form molecules

    • Why are elements compared to letters combining to form words in the text?

    <p>To illustrate the diversity and combinations possible with elements</p> Signup and view all the answers

    What differentiates chemicals from elements?

    <p>Chemicals are mixtures of elements, while elements are pure substances</p> Signup and view all the answers

    What are atoms made of according to the text?

    <p>Subatomic particles like electrons and protons</p> Signup and view all the answers

    How is an atom typically structured?

    <p>With a dense center and an outer, nearly empty zone around it</p> Signup and view all the answers

    What are the 3 main components found in an atom's nucleus?

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

    Which element has 2 protons, 2 electrons, and 2 neutrons?

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

    What determines the reactivity of an element and many of its properties?

    <p>The number of electrons in the electron cloud</p> Signup and view all the answers

    What is the lightest and most abundant element in the universe?

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

    Why are hydrogen and helium, despite similar protons and electrons, different in stability?

    <p>Due to having different numbers of neutrons</p> Signup and view all the answers

    Which category of elements on the Periodic Table are typically solid at room temperature and good conductors of electricity?

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

    Why are non-metal elements described as dull and brittle?

    <p>Due to being poor conductors of heat and electricity</p> Signup and view all the answers

    Why is water not considered an element?

    <p>Water consists of multiple types of atoms.</p> Signup and view all the answers

    How are elements different from chemicals according to the text?

    <p>Elements are made of one kind of atom, while chemicals can be compounds.</p> Signup and view all the answers

    What do elements combine to form, according to the text?

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

    What do atoms consist of, based on the text?

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

    Why are elements compared to letters combining to form words in the text?

    <p>To emphasize their unique properties</p> Signup and view all the answers

    What determines if something is considered matter according to the text?

    <p>Whether it can be broken down into other substances</p> Signup and view all the answers

    Why are elements described as pure substances according to the text?

    <p>They consist of only one type of atom</p> Signup and view all the answers

    What is the location of protons and neutrons in an atom?

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

    Which element is described as typically a solid and highly reactive?

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

    Why are hydrogen and helium mentioned as different despite their similar proton and electron numbers?

    <p>Helium is highly reactive while hydrogen is stable</p> Signup and view all the answers

    What determines the reactivity of an element and many of its properties?

    <p>Number and location of electrons</p> Signup and view all the answers

    Why are non-metal elements described as poor conductors of heat and electricity?

    <p>Lack of free-moving electrons</p> Signup and view all the answers

    What makes each element unique?

    <p>The number of protons</p> Signup and view all the answers

    How many natural elements are known to scientists?

    <p>92</p> Signup and view all the answers

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