Find the incorrect statement.

Options

A. Valence electron and valency is same for group 1
B. p- block element are metals nonmetals and metalloids
C. Noble gases have 8 valence electrons except He
D. Smallest atom of periodic table is He

Answer

To find the incorrect statement among the given options, we will analyze each statement one by one.

### Step 1: Analyze Option A
**Statement A:** "Valence electron and valency are the same for group B."

- Group B elements refer to transition metals. In these elements, the valence electrons can vary due to the involvement of d-orbitals. Hence, this statement is generally not true as valency can differ from the number of valence electrons.

### Step 2: Analyze Option B
**Statement B:** "P-block elements are metals, nonmetals, and metalloids."

- This statement is correct. The p-block of the periodic table contains a variety of elements, including metals (like lead), nonmetals (like nitrogen), and metalloids (like silicon).

### Step 3: Analyze Option C
**Statement C:** "Noble gases have 8 electrons except He."

- This statement is also correct. Noble gases (like Neon and Argon) have 8 valence electrons, while Helium has only 2 electrons.

### Step 4: Analyze Option D
**Statement D:** "The smallest atom of the periodic table is He."

- This statement is incorrect. The smallest atom in the periodic table is hydrogen, which has only one proton and one electron. Helium has two protons and two electrons, making it larger than hydrogen.

### Conclusion
The incorrect statement is **Option D:** "The smallest atom of the periodic table is He."

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