Ionisation energy

Ionisation energy is:

• the minimum amount of energy required to remove the outermost electron from an atom in its solid state

• the maximum amount of energy required to remove the outermost electron from an atom in its gaseous state

• the minimum amount of energy required to remove the outermost electron from an atom in its gaseous state

• none of the above

The equation for the first ionisation energy of a sodium atom is:

• Na (g) -> Na⁺ (g) + e^-

• Na⁺ (g) -> Na²⁺ (g) + e^-

• Na (s) -> Na⁺ (g) + e^-

• Na⁺ (g) + e^- -> Na (g)

Which of the following has a lowest first ionisation energy?

• Sodium (Na)

• Magnesium (Mg)

• Chlorine (Cl)

• Argon (Ar)

A shorter atomic radius of atoms in the same period will result in:

• A higher first ionisation energy

• A lower first ionisation energy

What is the name of the smallest atom?

Which has the lower first ionisation energy between magnesium and aluminium elements and why

• Magnesium because it has a lower nuclear charge and higher atomic radius

• Aluminium because it has fewer protons

• Magnesium because its outermost electron is removed from an orbital further from the nucleus

• Aluminium because it is removed from an orbital which is higher in energy