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Here are the characteristics of metals, non-metals, and their states when in the gaseous state:
**Metals**:
1. **State of matter at room temperature**: Solid
2. **Lustrousness**: Metals are typically lustrous, meaning they have a shiny or metallic appearance.
3. **Reaction with acid**: Most metals react with acids to produce hydrogen gas and a salt.
4. **Malleability**: Metals are malleable, which means they can be easily hammered or pressed into thin sheets.
**Non-Metals**:
1. **State of matter at room temperature**: Non-metals can exist in various states at room temperature. For example, nitrogen is a gas, sulfur is a solid, and oxygen is a gas.
2. **Lustrousness**: Non-metals are generally not lustrous; they often have a dull appearance.
3. **Reaction with acid**: Non-metals do not typically react with acids to produce hydrogen gas.
4. **Malleability**: Non-metals are not malleable; they are brittle and can easily break.
**Gaseous State (Highest State)**:
In the gaseous state, the distinction between metals and non-metals is not as relevant because both can exist as gases under different conditions. However, some elements have their highest natural state as gases at room temperature:
1. **Noble Gases**: Elements in the noble gases group, such as helium (He), neon (Ne), argon (Ar), krypton (Kr), and xenon (Xe), are gases at room temperature and pressure. They do not readily react with other elements.
Remember that the behavior of elements can vary based on conditions, and the classification of elements as metals or non-metals depends on their properties and behavior in typical conditions. Some elements exhibit characteristics of both metals and non-metals and are classified as metalloids.
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