Fill in the blanks by picking the correct option. There are_____groups and_______periods in the extended form of periodic table.The group,all members of which are in gaseous state under ordinary condition is_______group.Most electropositive elements belongs to_____group.

Options

A. 16,8.17,2
B. 18.7,18,1
C. 8,7,0,2
D. 16,8,18,1

Answer

To solve the question, we need to fill in the blanks with the correct options regarding the periodic table. Let's break it down step by step.

### Step 1: Determine the Number of Groups and Periods
The first part of the question asks how many groups and periods are in the extended form of the periodic table.

- In the modern periodic table, there are **18 groups** and **7 periods**.

### Step 2: Identify the Group with Gaseous Members
The next part of the question asks which group contains all members that are in the gaseous state under ordinary conditions.

- The group that contains all gaseous members is the **18th group**, known as the noble gases (e.g., Helium, Neon, Argon, etc.).

### Step 3: Identify the Most Electropositive Elements
The final part of the question asks which group contains the most electropositive elements.

- The most electropositive elements belong to the **1st group**, known as alkali metals (e.g., Lithium, Sodium, Potassium, etc.).

### Final Answer
Putting all the information together, we can fill in the blanks:
- There are **18 groups** and **7 periods** in the extended form of the periodic table.
- The group, all members of which are in gaseous state under ordinary conditions, is the **18th group**.
- Most electropositive elements belong to the **1st group**.

Thus, the complete filled statement is:
"There are **18** groups and **7** periods in the extended form of the periodic table. The group, all members of which are in gaseous state under ordinary conditions, is the **18th** group. Most electropositive elements belong to the **1st** group."