How are elements of compounds different
from pure elements?
The elements of compounds are different from pure elements in several ways:
1. Composition: Pure elements consist of only one type of atom, whereas compounds consist of two or more different types of atoms chemically bonded together. For example, oxygen is a pure element, while water (H2O) is a compound consisting of two hydrogen atoms bonded to one oxygen atom.
2. Properties: Pure elements have their own unique set of physical and chemical properties. However, when elements combine to form compounds, the properties of the compound can be very different from the properties of the individual elements. For example, sodium (a soft, silver metal) and chlorine (a greenish-yellow gas) are both elements with distinct properties. But when combined, they form sodium chloride (table salt), which is a white crystalline solid with different properties altogether.
3. Stability: Compounds, unlike pure elements, are often more stable due to the formation of strong chemical bonds between the atoms. This stability arises from the sharing or transfer of electrons between the elements involved in the compound. Pure elements tend to be more reactive and can readily combine with other elements to form compounds.
4. Formula Representation: Pure elements are represented by symbols on the periodic table, whereas compounds are represented by chemical formulas. Chemical formulas provide information about which elements are present in the compound and the ratio in which they are combined. For example, the chemical formula for glucose (C6H12O6) indicates that it consists of carbon, hydrogen, and oxygen in a specific ratio.
Overall, the elements of compounds are different from pure elements in terms of composition, properties, stability, and how they are represented.