Question

Complete the following table

Element	Atomic number(Z)	Mass number(A)	Number of protons	Number of electrons(e)	Number of neutrons(n)
$\mathrm{O}$

Answer 1

• The name of the element having symbol ($\mathrm{O}$) =$\mathrm{Oxygen}$.
• The elemental representation of a given element ($\mathrm{O}$) = ${}_8{}^{16}\mathrm{O}$
• Atomic number of an element is usually written as a subscript on the left-hand side of the chemical symbol. It has the symbol “Z”.
• Atomic number of $\mathrm{Oxygen}$ = 8
• The atomic number of an atom equals the total number of protons present in the nucleus of an atom
• Number of protons of $\mathrm{Oxygen}$ = 8
• In a neutral atom, the number of protons equals the number of electrons.
• Number of electrons in $\mathrm{Oxygen}$ = 8
• the Mass number of an element is usually written as a superscript on the left-hand side of the chemical symbol. It has the symbol “M”.
• the Mass number of an atom is the total number of protons and neutrons present in the nucleus of an atom.
• Mass number of $\mathrm{Oxygen}$ = 16
• Number of neutrons present in the atom = Mass number - Atomic number
• Number of neutrons present in the atom = 16-8 = 8

Element	Atomic number(Z)	Mass number(A)	Number of protons (p)	Number of electrons(e)	Number of neutrons(n)
$\mathrm{O}$	8	16	8	8	8