Final answer:
Examples of solid elements at room temperature include Iron and Copper, while Mercury and Bromine are examples of liquid elements. For gaseous states, Hydrogen and Oxygen represent two common elements at room temperature.
Step-by-step explanation:
In the periodic table of elements, there are both solids, liquids, and gases at room temperature. For solids, examples include Iron (Fe) and Copper (Cu). These substances are hard, don't flow and maintain their shapes. In terms of liquids, Mercury (Hg) and Bromine (Br) are two elements that remain liquid at room temperature. Liquids take the shape of the containers in which they are placed and flow easily. Lastly, for gases, we find elements such as Hydrogen (H2) and Oxygen (O2). These elements expand to fill their containers, and they can be easily compressed. Therefore, considering these distinct properties, the forms of matter can be clearly differentiated.
Learn more about States of Matter