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Science 5: c9:L2

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  • Who created the periodic table?
    Dmitri Mendeleev
  • How many known element are there in the world?
    118 elements
  • Can we create new elements, or are they all found in nature?
    Some elements are found in nature, but scientists can also create new ones in labs using special machines.
  • How to call the number of protons in an atom?
    the atomic number
  • The particle in an atom that has a negative charge
    electron
  • Why do scientists give each element a symbol, like H for hydrogen or O for oxygen?
    Symbols make it faster and easier to write and understand elements.
  • The particle in an atom that has no charge
    neutron
  • what are most common elements in space?
    Hydrogen and helium
  • The smallest unit of an element ( building block of things)
    atom
  • What is made up of two or more atoms that are joined together?
    molecule
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