Consider the following statements and arrange in the order of true/false as given in the codes.
`S_1`:In modern periodic table each block contains a number of columns equal to the number of electrons that can occupy that sub-shell
`S_2`:The greatest increase in ionization enthalpy is experienced on removal of electron from core noble gas configuration
`S_3` :The size of the isoelectronic species is effected by eletron-electron interaction in the outer orbitals
`S_4`:Any thing that influences the valence electrons will affect the chemistry of the element and the valence shell is not affected by nuclear mass.

Options

A. FFTT
B. TTFT
C. FTFT
D. TTTT

Explanation

To solve the problem, we need to evaluate each of the four statements (S1, S2, S3, S4) and determine whether they are true or false. Then, we will arrange them in the order of true/false as per the question.

### Step-by-Step Solution:

1. **Evaluate Statement S1**:
- **Statement**: In modern periodic table each block contains a number of columns equal to the number of electrons that can occupy that sub-shell.
- **Analysis**:
- The S-block has 2 columns (can hold 2 electrons).
- The P-block has 6 columns (can hold 6 electrons).
- The D-block has 10 columns (can hold 10 electrons).
- The F-block has 14 columns (can hold 14 electrons).
- **Conclusion**: This statement is **True**.

2. **Evaluate Statement S2**:
- **Statement**: The greatest increase in ionization enthalpy is experienced on removal of electron from core noble gas configuration.
- **Analysis**:
- Noble gases have a complete outer shell, making them very stable.
- Removing an electron from a noble gas configuration requires a significant amount of energy, resulting in a large increase in ionization enthalpy.
- **Conclusion**: This statement is **True**.

3. **Evaluate Statement S3**:
- **Statement**: The size of the isoelectronic species is affected by electron-electron interaction in the outer orbitals.
- **Analysis**:
- Isoelectronic species have the same number of electrons but different nuclear charges.
- The size of these species is influenced by the nuclear charge; higher nuclear charge results in a smaller size.
- Electron-electron interactions also play a role in determining size.
- **Conclusion**: This statement is **True**.

4. **Evaluate Statement S4**:
- **Statement**: Anything that influences the valence electrons will affect the chemistry of the element and the valence shell is not affected by nuclear mass.
- **Analysis**:
- Valence electrons are crucial for chemical reactivity and bonding.
- The nuclear mass does not directly affect the valence shell configuration, but it can influence the stability of the atom.
- **Conclusion**: This statement is **True**.

### Final Arrangement:
- All statements (S1, S2, S3, S4) are **True**.

### Code for the arrangement:
- Since all statements are true, the code would be: **D** (indicating all statements are true).