Q7. Differentiate between Elements and compounds.
Elements
Compounds
Answers
Differentiating Property
Element
Compound
1
Definition
Elements are pure substances which are composed of only one type of atom.
Compound are substances which are formed by two or more different types of elements that are united chemically in fixed proportions.
2
Total Numbers
There are nearly 118 elements (at present) of which nearly 94 occur naturally on Earth.
Compounds are almost endless.
3
Types
Elements are classified as either metals, nonmetals or metalloids.
Compounds are classified according to their bonds which can be ionic, molecular or metallic.
4
Examples
Some of the examples of elements are Iron, Copper, Gold, etc.
A few examples of compounds are NAOH, NaCl, etc.
5
Representation
Elements are represented by symbols and numbers. For example, Sodium is represented by Na.
Compounds are represented by their chemical formula. For example, salt is represented by the formula NaCl.
6
Distinguished By
Elements can be distinguished by their atomic number.
Distinguished by their fixed ratio of different elements (arranged in a defined manner).
7
Composition and Property
As only one type of atoms make up an element, all the properties of that atom are represented by its atom.
In case of compounds, the same type of molecules makes up the compound.
8
Ability to Breakdown
Elements cannot be broken down by chemical reactions.
Answer:
A compound contains atoms of different elements chemically combined together in fixed ratio.
An element is a pure chemical substance made of same type of atom.
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