Radium oxide (RaO) has not been characterized well past its existence, despite oxides being common compounds for the other alkaline earth metals. Radium hydroxide (Ra(OH)2) is the most readily soluble among the alkaline earth hydroxides and is a stronger base than its barium congener, barium hydroxide.

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Elements at the extreme left of the periodic table r most BASIC oxides in nature.
Elements at the extreme right of the 0eriodic table r
most ACIDIC oxides in nature.
Elements in the centre r AMPHOTERIC or NEUTRAL.
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Introduction:
Radium is a highly radioactive element that belongs to the alkaline earth metals group. It is a rare and unstable element that is found in small amounts in the Earth's crust. Radium also forms various compounds, including oxides.

Explanation:
The oxide of radium, known as radium oxide (RaO), is a basic compound. This means that it has basic properties and can react with acids to form salts and water. Let's explore the reasons behind this classification:

1. Definition of basic oxide:
A basic oxide is an oxide that reacts with water to form a base. Bases are substances that can accept protons (H+) or donate pairs of electrons. They have a pH greater than 7 and can neutralize acids.

2. Reactivity with water:
Radium oxide readily reacts with water to form radium hydroxide (Ra(OH)2), which is a strong base. This reaction can be represented as follows:
RaO + H2O → Ra(OH)2

3. Formation of a basic solution:
When radium oxide reacts with water, it produces hydroxide ions (OH-) that increase the concentration of hydroxide ions in the solution. This results in a basic pH.

4. Reaction with acids:
Being a basic compound, radium oxide can react with acids to form salts and water. The hydroxide ions from the radium hydroxide react with the hydrogen ions (H+) from the acid to form water. For example:
Ra(OH)2 + 2HCl → RaCl2 + 2H2O

Conclusion:
In conclusion, the oxide of radium is classified as a basic compound because it reacts with water to form a strong base (radium hydroxide). It can also neutralize acids by reacting with them to form salts and water.