Question

decide which element probably forms a compound with oxygen that has a chemical formed by oxygen and beryllium.
comparing chemical formula of compound formed with oxygen:
\t\t\tlithium\trubidium\tbarium\tphosphorus
most similar to beryllium\t○\t○\t○\t○
least similar to beryllium\t○\t○\t○\t○

Explanation:

Step1: Recall periodic table trends

Beryllium (Be) is an alkaline earth metal (Group 2). Elements in the same group have similar chemical properties.

Step2: Classify given elements

• Lithium (Li): Group 1 (alkali metal)
• Rubidium (Rb): Group 1 (alkali metal)
• Barium (Ba): Group 2 (alkaline earth metal)
• Phosphorus (P): Group 15 (non - metal)

Step3: Determine similarity

Since Barium is in the same group (Group 2) as Beryllium, it will form a compound with oxygen most similar to the compound formed by oxygen and beryllium. Phosphorus is a non - metal in a different group, so it will form a compound least similar to that of beryllium and oxygen.

Answer:

• Most similar to beryllium: B. barium
• Least similar to beryllium: D. phosphorus