Fill in the blanks :
(a) Dalton said that _______________ could not be divided.
(b) An ion which has a positive charge is called a _______________
(c) The outermost shell of an atom is known as _______________
(d) The _______________ of an atom is very hard and dense.
(e) Neutrons are __________________ particles having mass equal to that of portons.
(f) Isotopes are the atoms of __________________element having the __________________atomic number but __________________mass number.
What is the maximum number of electrons which can be accommodated in the :
(b) outermost shell of an atom?
An atom having a completely filled outermost shell: