Atomic number of N is 7. the atomic number of IIIrd member of nitrogen family is

Options

A. 23
B. 15
C. 33
D. 43

Explanation

To find the atomic number of the third member of the nitrogen family, we can follow these steps:

### Step 1: Identify the atomic number of nitrogen.
The atomic number of nitrogen (N) is given as 7.

### Step 2: Understand the position of nitrogen in the periodic table.
Nitrogen is located in Group 15 (or Group V) of the periodic table. The members of this group include nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi).

### Step 3: Determine the atomic number of the third member of the nitrogen family.
The first member is nitrogen (N) with atomic number 7. The second member is phosphorus (P), which is in the next period (third period) and has an atomic number of 15. The third member is arsenic (As), which is in the fourth period.

### Step 4: Calculate the atomic number of arsenic (As).
To find the atomic number of arsenic, we can add 8 to the atomic number of nitrogen to find the atomic number of phosphorus, and then add another 8 to find the atomic number of arsenic:
- Atomic number of nitrogen (N) = 7
- Atomic number of phosphorus (P) = 7 + 8 = 15
- Atomic number of arsenic (As) = 15 + 18 = 33

### Conclusion:
The atomic number of the third member of the nitrogen family (arsenic) is **33**.

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