Consider the successive ionisation energy for an element 'A'
`IE_(1),IE_(2),IE_(3),IE_(4),IE_(5)` are 100 eV, 150 eV, 181 eV, 2000 eV, 2200 eV.
Select correct statement(s) for element 'A':

Options

A. Element 'A' may be metal
B. Element 'a' may form trivalent cation
C. Oxide of element 'A' may be amphoteric
D. Element 'A' may be non-metal

Answer

To solve the problem regarding the successive ionization energies of element 'A', we will analyze the given ionization energies step by step.

### Step 1: Analyze the Ionization Energies
The provided ionization energies are:
- IE₁ = 100 eV
- IE₂ = 150 eV
- IE₃ = 181 eV
- IE₄ = 2000 eV
- IE₅ = 2200 eV

### Step 2: Identify Trends in Ionization Energies
Notice that the first three ionization energies (IE₁, IE₂, IE₃) show a gradual increase. However, there is a significant jump between IE₃ (181 eV) and IE₄ (2000 eV). This indicates that removing the fourth electron requires a much larger amount of energy compared to the first three.

### Step 3: Interpret the Large Jump in Ionization Energy
The large jump in ionization energy suggests that after removing three electrons, the remaining electron configuration is likely stable, possibly resembling a noble gas configuration or a half-filled subshell. This stability makes it much harder to remove the fourth electron.

### Step 4: Determine the Possible Electron Configuration
Given that the first three electrons can be removed relatively easily, while the fourth requires a lot of energy, it suggests that element 'A' has an electron configuration that could be represented as ns² np¹ (where n is the principal quantum number). This configuration is typical of elements in Group 13 of the periodic table, such as aluminum.

### Step 5: Conclusion on Element 'A'
Based on the analysis:
- Element 'A' likely belongs to Group 13 (the boron group).
- It can form a trivalent cation (A³⁺) easily due to the removal of three electrons.
- The element could exhibit amphoteric behavior, as seen in aluminum, which can react both as an acid and a base.
- The element may also show non-metallic character, especially if it is in a higher period (as we move down the group, non-metallic character increases).

### Final Statements
Thus, the correct statements regarding element 'A' are:
1. It can form a trivalent cation (A³⁺).
2. It may exhibit amphoteric behavior.
3. It could also be a non-metal.