The Alkaline Earth Metals (Leaving Cert Chemistry): Flashcards

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The Alkaline Earth Metals
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Group number of alkaline earth metals

Group 2

3 main alkaline earth metals for Leaving Cert

Beryllium (Be), Magnesium (Mg), Calcium (Ca)

Physical state of alkaline earth metals at room temp

Solid

Conductivity of alkaline earth metals

Good conductors of electricity and heat

Electrons lost by alkaline earth metals

Two outermost electrons

Product when alkaline earth metals react with O2\text{O}_2

Metal oxides

Beryllium's reaction with water

No reaction

Calcium's reaction with cold water

Reacts quickly

Gas produced in alkaline earth metal + water reactions

Hydrogen gas (H2\text{H}_2)

Reactivity trend down Group 2 (Be to Ca)

Reactivity increases

Why reactivity increases down Group 2

Atomic radius & shielding ↑; ionisation energy ↓

First ionisation energy trend down Group 2

Decreases

Common name for CaCO3\text{CaCO}_3

Limestone

Equation: Mg + oxygen

2Mg+O2→2MgO2\text{Mg} + \text{O}_2 \rightarrow 2\text{MgO}

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