trends in the periodic table

• How does atomic radius change as you go down a group in the periodic table?

  The atomic radius gets bigger as you go down a group.
• What happens to atomic radius as you move left to right across a period?

  The atomic radius gets smaller as you move left to right across a period.
• Why do atoms get bigger as you go down a group?

  Atoms get bigger because there are more shells as you go down a group.
• Why do atoms get smaller as you move left to right across a period?

  Atoms get smaller because there are more protons, increasing the attraction between electrons and protons.
• What is electronegativity?

  Electronegativity is how much an atom in a compound attracts the electrons they share.
• Which atom is considered the most attractive in terms of electronegativity?

  Fluorine is considered the most attractive atom in terms of electronegativity.
• Why is fluorine the most attractive atom for electrons?


  Fluorine is the most attractive because it has more protons and is the smallest atom.
• Why do noble gases not have electronegativity values?

  Noble gases do not form bonds, so electronegativity does not apply to them.
• What happens if the difference in electronegativity is greater than two?

  If the difference in electronegativity is greater than two, one atom will take all the electrons, forming an ionic bond.
• Why do group two metals have a higher melting point than group one metals?

  Group two metals have a higher melting point because they have more delocalized electrons.
• What happens to the melting point as you go down a group of metals?

  The melting point gets smaller as you go down a group of metals.
• Why does the melting point decrease as you go down a group of metals?

  The melting point decreases because the atoms are bigger, reducing the electrostatic attraction between the nuclei and the free electrons.
• What are the key trends in the periodic table discussed in the material?

  • Atomic radius
  • Electronegativity
  • Melting point
• Which element has the highest ionization energy among the first 20 elements?


  Helium has the highest ionization energy among the first 20 elements.
• Which element has the lowest ionization energy among the first 20 elements?


  Francium has the lowest ionization energy among the first 20 elements.