Which of the following statements is not true about an atom?

  • A
    Atoms are the basic units from which molecules and ions are formed.
  • B
    Atoms are not able to exist independently.
  • C
    Atoms are always neutral in nature.
  • D
    Atoms aggregate in large numbers to form the matter that we can see, feel or touch.

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The unit accepted for measuring the mass of an atom and a molecule is

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Define Avogadro's constant. How is it related to a mole?

Differentiate between atomic mass and mass number.

Name the international organisation which approves the names given to the elements. Write the symbol of tungsten.

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