Question

1. fill in the table with the elements using the law of octaves.

h li be c n o
f mg al si p
k ca cr ti mn fe

Explanation:

Step1: Recall the Law of Octaves

The Law of Octaves states that when elements are arranged in order of increasing atomic mass, every eighth element has similar properties.

Step2: Identify the missing elements

• For the first row: After Be, the element should be B (Boron) as it follows the order of elements.
• For the second row: After F, the element should be Na (Sodium) as per the order. And after P, the element should be S (Sulfur).
• For the third row: After the blank, K comes. Since the previous element in the octave - like pattern (if we consider the previous rows' pattern of starting with a non - metal in the first row, metal - like in the second, and continuing the order), the element before K should be Cl (Chlorine).

Answer:

First row: B
Second row: Na, S
Third row: Cl