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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

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 ?

In a sample of ethyl ethanoate (CH3COOC9H5) the two oxygen atoms have the same number of electrons b...

Multiple choice question

In a sample of ethyl ethanoate (CH3COOC9H5) the
two oxygen atoms have the same number of
electrons but different number of neutrons. Which
of the following is the correct reason for it ?

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