Which of the following statements is incorrect ?

Options

A. Isobars possess same chemical properties .
B. Isotopes occupy same position in periodic table .
C. Isotopes possess same atomic number
D. In Isobars , the total number of protons and neutrons in the nucleus is same .

Explanation

To determine which statement is incorrect among the given options, let's analyze each one step by step.

### Step 1: Understand Isotopes
- **Definition**: Isotopes are atoms of the same element that have the same atomic number (same number of protons) but different mass numbers (different number of neutrons).
- **Chemical Properties**: Since isotopes have the same number of protons and electrons, they exhibit the same chemical properties.

### Step 2: Understand Isobars
- **Definition**: Isobars are atoms of different elements that have the same mass number but different atomic numbers (different number of protons).
- **Chemical Properties**: Because isobars have different atomic numbers, they have different numbers of electrons, leading to different chemical properties.

### Step 3: Analyze Each Option
- **Option A**: "Isobars possess the same chemical properties."
- **Analysis**: This is incorrect because isobars have different atomic numbers and therefore different chemical properties.

- **Option B**: "Isotopes occupy the same position in the periodic table."
- **Analysis**: This is correct because isotopes of an element are found in the same position in the periodic table.

- **Option C**: "Isotopes possess the same atomic number."
- **Analysis**: This is correct as isotopes have the same number of protons (same atomic number).

- **Option D**: "In isobars, the total number of protons and neutrons in the nucleus is the same."
- **Analysis**: This is correct because isobars have the same mass number, which is the sum of protons and neutrons.

### Conclusion
After analyzing all the options, the incorrect statement is **Option A**: "Isobars possess the same chemical properties."