1. Name the most abundant element of group two.
2. What is the role of magnesium in plants?
3. Explain why elements of group two form M 2 + ions and not M 3 + ions.
4. Which metal among Na or Mg has higher second ionisation enthalpy? Explain the reason.
1. The most abundant element in group 2 is Calcium.
2. Magnesium helps in the absorption of sunlight from the sun and carry out the process of photosynthesis smoothly.
3. The group 2 elements have valence configuration ns2, so as two electrons are present in valence orbital, so it forms M2+ ion and not M3+ as losing third electron from noble gas configuration is difficult.
4. Na has higher ionisation energy as it is difficult to knock out second electron as it has noble gas configuration.
2. Magnesium helps in the absorption of sunlight from the sun and carry out the process of photosynthesis smoothly.
3. The group 2 elements have valence configuration ns2, so as two electrons are present in valence orbital, so it forms M2+ ion and not M3+ as losing third electron from noble gas configuration is difficult.
4. Na has higher ionisation energy as it is difficult to knock out second electron as it has noble gas configuration.