Question

13 multiple choice 1 point put the following in order from smallest to biggest: se, k, f k, se, f se, k, f f, se, k se, f, k

Explanation:

Step1: Recall atomic - size trend

Atomic size increases down a group and decreases across a period from left to right in the periodic table.

Step2: Locate elements in periodic table

F (Fluorine) is in Group 17 and Period 2. Se (Selenium) is in Group 16 and Period 4. K (Potassium) is in Group 1 and Period 4.

Step3: Compare sizes

F is the smallest as it is in the second - period. Among Se and K which are in the same period, K is larger as it is on the left - hand side of the periodic table compared to Se. So the order from smallest to largest is F, Se, K.

Answer:

C. F, Se, K