Question

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

Explanation:

Step1: Recall atomic size trend

Atomic size increases down a group and decreases across a period in the periodic table. Fluorine (F) is in Group 17 and Period 2, selenium (Se) is in Group 16 and Period 4, and potassium (K) is in Group 1 and Period 4.

Step2: Compare sizes

F has the smallest atomic size as it is in the second - period. Among Se and K, K is larger because it is in Group 1 (has a single valence electron and less effective nuclear charge compared to Se in Group 16). So the order from smallest to largest is F, Se, K.

Answer:

F, Se, K