Give experimental evidence to show that the nucleus of an atom is positively charged.

Give experimental evidence to show that the entire mass of an atom is practically concentrated in its nucleus

(a) Why does helium have zero valecy? (b) Name the secientist and his experiment to prove that nucleus of an atom is positively charged.

Is the atom as a whole positively charged ?

What experimental evidence can be cited to show that the speed of sound is the same for all wavelengths?

The positive charge of an atom is.

Give reasons for the following: (a) Isotopes of an element are chemically similar. , (b) An atom is electrically neutral (c ) Nobles gases show least reactivity , (d) Nucleus of an atom is heavy and positively charged (e ) Ions are more stable than atoms.

What experimental evidence is there fro assuming that the speed of sound is the same for all the wavelengths ?

Define a compounds Give two points of evidence to show that sodium chloride is a compound.