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Periodicity

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  • Which is the the most reactive group of metals?
    The alkali metals
  • What is the first ionisation energy?
    The first ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms to form one mole of gaseous 1+ ions.
  • Is the sodium cation (Na+) radius bigger or smaller than the sodium neutral atom radius?
    smaller
  • Which of the two, metals or non-metals, tend to gain electrons to form negative ions (anions) instead of losing electrons to form positive ions?
    Non-metals
  • What is electronegativity?
    Electronegativity is defined as the attraction of an atom for a bonding pair of electrons.
  • What are the 3 most electronegative elements?
    F, O, N
  • Which of the following IS NOT a periodic trend: bond enthalpy, atomic radius or effective nuclear charge?
    bond enthalpy
  • How do you prove an oxide is a basic oxide?
    Basic oxides dissolve in water to produce basic solutions.
  • Which is the most reactive group of non-metals?
    The Halogens
  • Atomic radius increase from ______ to _______ in the same group.
    top to bottom
  • Is MgO a basic or acidic oxide?
    basic
  • Is the chlorine anion (Cl-) radius bigger or smaller than the chlorine neutral atom radius?
    bigger
  • Mg2+ and O2- are isoelectronic. What does it mean?
    That they have the same number os electrons
  • The elements are arranged in order of increasing __________.
    nuclear charge or number or protons
  • What is the effective nuclear charge of sodium (Z = 11)?
    +1
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