Which of the following pairs would have a larger size? Explain.
P or As

Explanation

To determine which of the two elements, phosphorus (P) or arsenic (As), has a larger atomic size, we can follow these steps:

### Step 1: Identify the Group and Period
Phosphorus (P) has an atomic number of 15 and is located in Group 15 of the periodic table. Arsenic (As) has an atomic number of 33 and is also located in Group 15. Both elements belong to the same group but are in different periods.

### Step 2: Understand the Trend in Atomic Size
In the periodic table, atomic size increases as you move down a group. This is because as you move down a group, additional electron shells are added to the atoms. Each new shell increases the distance between the nucleus and the outermost electrons, leading to a larger atomic radius.

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