26. match the element with the number of valence electrons they have. draggable item → category phosphorus…

Explanation:

Step1: Recall valence - electron rules

Valence electrons are determined by the group number in the periodic table (for main - group elements).

Step2: Identify group of Phosphorus

Phosphorus is in Group 15. Main - group elements in Group 15 have 5 valence electrons. So, Phosphorus (P) $\to$ 5.

Step3: Identify group of Aluminum

Aluminum is in Group 13. Main - group elements in Group 13 have 3 valence electrons. So, Aluminum (Al) $\to$ 3.

Step4: Identify group of Calcium

Calcium is in Group 2. Main - group elements in Group 2 have 2 valence electrons. So, Calcium (Ca) $\to$ 2.

Step5: Identify group of Sulfur

Sulfur is in Group 16. Main - group elements in Group 16 have 6 valence electrons. So, Sulfur (S) $\to$ 6.

Step6: Identify group of Potassium

Potassium is in Group 1. Main - group elements in Group 1 have 1 valence electron. So, Potassium (K) $\to$ 1.

Step7: Identify group of Iodine

Iodine is in Group 17. Main - group elements in Group 17 have 7 valence electrons. So, Iodine (I) $\to$ 7.

Answer:

Phosphorus (P) $\to$ 5 Aluminum (Al) $\to$ 3 Calcium (Ca) $\to$ 2 Sulfur (S) $\to$ 6 Potassium (K) $\to$ 1 Iodine (I) $\to$ 7