Question

type the element in each list with the largest atomic radius: na, al, mg rb, f, n ca, sr, ba fr, be, k

Explanation:

Step1: Recall atomic - radius trend

Atomic radius increases down a group and decreases across a period.

Step2: Analyze Na, Al, Mg

Na, Mg, Al are in the same period (Period 3). Na is in Group 1, Mg in Group 2 and Al in Group 13. Since atomic radius decreases across a period, Na has the largest atomic radius among them.

Step3: Analyze Rb, F, N

Rb is in Group 1 and Period 5, F is in Group 17 and Period 2, N is in Group 15 and Period 2. Rb is in a much lower - period and has the largest atomic radius.

Step4: Analyze Ca, Sr, Ba

Ca, Sr, Ba are in the same group (Group 2). Atomic radius increases down a group, so Ba has the largest atomic radius.

Step5: Analyze Fr, Be, K

Fr is in Group 1 and Period 7, Be is in Group 2 and Period 2, K is in Group 1 and Period 4. Fr has the largest atomic radius as it is in the lowest period among them.

Answer:

Na
Rb
Ba
Fr