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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

Which of the following are true for an element ? (i) Atomic number = number of protons + number of e...

Multiple choice question

Which of the following are true for an element ?
(i) Atomic number = number of protons + number
of electrons
(ii) Mass number = number of protons + number
of neutrons
(iii) Atomic mass = number of protons = number
of neutrons
(iv) Atomic number = number of protons = number
of electrons

In the Thomson's model of atom, which of the following statements are correct ? (i) the mass of the ...

Multiple choice question

In the Thomson's model of atom, which of the
following statements are correct ?
(i) the mass of the atom is assumed to be uniformly
distributed over the atom
(ii) the positive charge is assumed to be uniformly
distributed over the atom
(iii) the electrons are uniformly distributed in the
positively charged sphere
(iv) the electrons attract each other to stabilise the
atom

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