Periodicity: Group 2, Alkaline Earth Metals - Trends Flashcards

1
Q

Describe the trend in atomic radius as you descend group 2

A
  • Atomic radius increases

- Number of electron shells increase as you descend group

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2
Q

Describe the trend in first ionisation energy as you descend group 2

A
  • First ionisation energy decreases
  • More electron shells, means outer electrons are further away from nucleus
  • Increased shielding
  • Weaker attraction of ion to lost electrons
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3
Q

Describe the trend in reactivity as you descend group 2

A
  • When group 2 elements react, they lose electrons, forming positive ions
  • The easier it is to remove electrons (the lower the first ionisation energy), the more reactive the element
  • Reactivity increases down the group
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4
Q

Describe the trend in melting point from Mg-Ba

A
  • Melting points generally decrease (Mg decreases by a significant amount)
  • Metallic bonds are weaker
  • Size of the metal ion increases, resulting in less attraction between the nucleus of the positive ions and the delocalised electrons
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5
Q

Describe the trend in reactivity with water as you descend group 2

A
  • Reactivity with water increases
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