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CBSE Notes 2011-2012 » IX-Science-Term2

Structure of the Atom

An atom with 3 protons and 4 neutrons will have a valency of

Multiple choice question

An atom with 3 protons and 4 neutrons will have a
valency of

The electron distribution in an aluminium atom is

Multiple choice question

The electron distribution in an aluminium atom is

Which of the following statement is always correct ?

Multiple choice question

Which of the following statement is always correct ?

Atomic models have been improved over the years. Arrange the following atomic models in the order of...

Multiple choice question

Atomic models have been improved over the years.
Arrange the following atomic models in the order
of their chronological order
(i) Rutherford's atomic model
(ii) Thomson's atomic model
(iii)Bohr's atomic model

Rutherford's a-particle scattering experiment showed that (i) electrons have negative charge (ii) th...

Multiple choice question

Rutherford's a-particle scattering experiment
showed that
(i) electrons have negative charge
(ii) the mass and positive charge of the atom is
concentrated in the nucleus
(iii) neutron exists in the nucleus
(iv) most of the space in atom is empty
Which of the above statements are correct ?

The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutro...

Multiple choice question

The ion of an element has 3 positive charges. Mass
number of the atom is 27 and the number of
neutrons is 14. What is the number of electrons in
the ion ?

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