Atoms
the smallest
component of an element having the chemical properties of the element,
consisting of a nucleus containing combinations of neutrons and protons and one
or more electrons bound to the nucleus by electrical attraction. Atomic number
equal to the number of protons present in nucleus.
Elements
An element is pure substance and consists of a single type of atoms. Each atom type contains the same number of protons.An element is a substance that cannot be broken down by either physical or chemical change.Examples : The periodic table of elements is ordered by ascending atomic number. Notice that element can exist as either atoms like Fe (iron atom) or molecules, for example N2 (nitrogen molecule).
Molecules An element is pure substance and consists of a single type of atoms. Each atom type contains the same number of protons.An element is a substance that cannot be broken down by either physical or chemical change.Examples : The periodic table of elements is ordered by ascending atomic number. Notice that element can exist as either atoms like Fe (iron atom) or molecules, for example N2 (nitrogen molecule).
Molecules having same kind of two or more atoms that are chemically joined together. The atoms of certain elements readily bond with other atoms to form molecules. Molecules do not have an electrical charge on them, and can exist in a solid, liquid, or gas shape with different weights and sizes.
Molecular hydrogen (H2), molecular oxygen (O2)
and molecular nitrogen (N2)
Compounds having different kind of two or more elements that are chemically joined together with fixed ratios. compounds can not break down in to simpler forms by physical method,they can change by chemical reactions. Compound is completely new substance , the properties of compounds are differ from their elements properties .
For example, salt is made up of two elements: chlorine, which is
poisonous; and sodium, which reacts explosively with water.
All compounds are molecules but all molecules are not compounds.
Compounds are joint together by chemical bonds . covalent and ionic bonds. so compounds divided in to covalent compounds and ionic compounds.
Compounds are joint together by chemical bonds . covalent and ionic bonds. so compounds divided in to covalent compounds and ionic compounds.
Mixtures
A mixture consist of two or more different substances that are mixed
but not chemically combined together.
constituent substances are not in fixed
ratio. mixture shows properties of constituent substances .
constituent substances can separated by simple
physical method.
Mixtures are divided in to two types 1.homogeneous : that means uniform example solutions.
2.heterogeneous :non uniform.
