The basic unit of matter is ______.

_______ is positively charged.

Nucleons comprises of _______.

____________ is made up of two or more atoms

Whose theory does not propose anything about the positive and negative charges of an atoms.

The smaller particles found in the atom are called _______.

The _______ revolve around the nucleus.

There are two electrons in the outermost orbit of the magnesium atom. Hence, the valency of magnesium is_______.

____________ is the smallest particle of a chemical element.

____________ compared an atom to a watermelon.

A neutron is a neutral particle

The outermost orbit of an atom can have more than 8 electrons.

Rutherford used beta particles in his scattering experiments

The combining capacity of an element is called mass number.

Mass number determines the number of atoms of an element that combines with atom or atoms of another type.

Sun : Nucleus :: planets :_______

K : Potassium :: C : __________.

Define - Atom.

What is atomic number?

What is atomic number?

What is an electron?

Distinguish Isotopes from Isobar.

Differentiate mass number from atomic number.

Define isotopes? Give example.

Draw the structure of an atom and explain the position of the sub-atomic particles.

What are nucleons? Why are they called so? Write the properties of the nucleons.