DEFINITIONS
 
 
Define a nucleus.
Generally the nucleus of an atom has the following features:
NUCLEUS
 
The center part of an atom is called Nucleus.
SHAPE OF NUCLEUS
 
nucleus has spherical shape.
SIZE OF NUCLEUS
 
Nucleus has very small size. Diameter of nucleus is about 1x10 -14m.
CHARGE OF NUCLEUS
 
It has positive charge due to presence of proton.
NUCLEON
 
Neutron and protons are collectively known as Nucleon.
.
ATOMIC NUMBER
OR
CHARGE NUMBER
 
Total number of proton in the nucleus of an atom is called its atomic number.
OR
Total number of electrons in an atom is also known as atomic number,because
in an atom number of an electron are always equal to proton.
SYMBOL
 
It is denoted by z
z = number of protons
OR
z = number of electron
.
MASS NUMBER
 
Total number of a proton and neutrons in an atom is called Mass number.
SYMBOL
 
It is denoted by (A).
FORMULA
 
A = no. of proton + no of neutron
A = p+ n
OR
A = Z + n.
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