Question

instructions: in each question, identify the element with the greatest atomic radius:

1. carbon (c), lead (pb), silicon (si), tin (sn)
2. sulfur (s), silicon (si), argon (ar), sodium (na)
3. nickel (ni), titanium (ti), calcium (ca), barium (ba)

Explanation:

1)

Step1: Analyze the position of elements in the periodic table

Atomic radius increases down a group. Carbon (C) is in period 2, Silicon (Si) in period 3, Tin (Sn) in period 5 and Lead (Pb) in period 6.

Step2: Determine the element with the largest atomic radius

Since Lead (Pb) is in the lowest - period among them (period 6), it has the largest atomic radius.

2)

Step1: Analyze the position of elements in the periodic table

In a period (all these elements are in period 3), atomic radius decreases from left to right. Sodium (Na) is the left - most element among Sodium (Na), Silicon (Si), Sulfur (S) and Argon (Ar).

Step2: Determine the element with the largest atomic radius

As atomic radius decreases from left to right in a period, Sodium (Na) has the largest atomic radius.

3)

Step1: Analyze the position of elements in the periodic table

Atomic radius increases down a group. Nickel (Ni) is in period 4, Titanium (Ti) in period 4, Calcium (Ca) in period 4 and Barium (Ba) in period 6.

Step2: Determine the element with the largest atomic radius

Since Barium (Ba) is in the lowest - period (period 6) among them, it has the largest atomic radius.

Answer:

1. Lead (Pb)
2. Sodium (Na)
3. Barium (Ba)