Question

question 49
which of the atoms listed below has the smallest radius?
a al
b p
c as
d te

Explanation:

Step1: Recall atomic - radius trend

Atomic radius decreases across a period and increases down a group in the periodic table.

Step2: Locate elements in periodic table

Al (Aluminum) is in Group 13 and Period 3. P (Phosphorus) is in Group 15 and Period 3. As (Arsenic) is in Group 15 and Period 4. Te (Tellurium) is in Group 16 and Period 5.

Step3: Compare based on trends

Since Al and P are in the same period (Period 3), and P is to the right of Al, P has a smaller radius than Al. Also, As is in a lower - period than Te and P is in a higher - period than As. So, P has the smallest radius among the given elements.

Answer:

B. P