Science: Chemistry

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Science: Chemistry
2010-11-02 02:05:09

What makes up the universe.
Show Answers:

  1. How did the atom''s name originate?
    Atom comes from the greek word "atomos" which means uncuttable and indivisible.
  2. What does the nucleus of an atom contain?
    Protons and Neutrons.
  3. What are the charges of the following particles: proton, neutron and electron?
    Protons are positively charged, neutrons have no charge (are neutral) and electrons are negatively charged.
  4. What is the atomic number of an atom?
    The atomic number is the number of protons in an atom (also means number of electrons). This determines where the element sits on the periodic table.
  5. What is the mass number of an atom?
    The mass number is the number of protons and neutrons added together. Basically, the mass of the atoms nucleus.
  6. Which is the lightest element and why?
    Hydrogen is the lightest element as it only has one proton, one neutron and one electron, meaning that the elements overall mass is smaller than the other atoms as they contain more.
  7. What makes an atom stick together?
    The opposite charges of the protons (positive) and electrons (negative) are attracted to each other. This keeps the atoms stuck together.
  8. What is the electron configuration of all atoms?
    In an atom the first valence shell contains up to 2 electrons, the second contains up to 8, the third up to 8 and the fourth up to 8. You must fill up each level of the valence shells.