2.2.1 Trends in Group 2 : Alkaline earth metals Flashcards

1
Q

Noteson Alkaline metals

A
  • 2+ charge
  • Ionic compounds
  • Reducing agents
  • Down group more reactive
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2
Q

Why do group 2 elements become more reactive going down the group?

A
  • Ionisation energy decreases down group
  • Nuclear charge increases
  • But shielding increases
  • Atomic radius increases (greater distance from protons in nucleus to outer electrons)
  • So these 2 outweigh the increasing nuclear charge
  • Less energy required to lose electrons, so more reactive going down group
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3
Q

Examples of how reactivity increases going down group 2?

A

With dilute HCL, bubbles of H2 gas are given off more vigorously.

With oxygen, barium needs to be stored in oil to prevent reacting with O2 in air

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4
Q

What are the physical trends going down group 2?

A
  • Melting point decreases
  • Atomic radius increases
  • So attraction between nucleus and bonding electrons decreases
  • Causing decrease in melting point
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