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Structure Of The Atoms

Why did Rutherford select a gold foil in his α–ray scattering experiment?

05/11/2024

Science

9th

Structure Of The Atoms

Write any two observations which support the fact that atoms are divisible.

05/11/2024

Science

9th

Structure Of The Atoms

Is it possible for the atom of an element to have one electron, one proton
and no neutron. If so, name the element.

05/11/2024

Science

9th

Structure Of The Atoms

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
(a) (i), (ii) and (iii)
(b) (ii), (iii) and (i)
(c) (ii), (i) and (iii)
(d) (iii), (ii) and (i)

05/11/2024

Science

9th

Structure Of The Atoms

Which of the following statement is always correct?
(a) An atom has equal number of electrons and protons.
(b) An atom has equal number of electrons and neutrons.
(c) An atom has equal number of protons and neutrons.
(d) An atom has equal number of electrons, protons and neutrons.

05/11/2024

Science

9th

Structure Of The Atoms

The electron distribution in an aluminium atom is
(a) 2, 8, 3
(b) 2, 8, 2
(c) 8, 2, 3
(d) 2, 3, 8

05/11/2024

Science

9th

Structure Of The Atoms

An atom with 3 protons and 4 neutrons will have a valency of
(a) 3
(b) 7
(c) 1
(d) 4

05/11/2024

Science

9th

Structure Of The Atoms

The first model of an atom was given by
(a) N. Bohr
(b) E. Goldstein
(c) Rutherford
(d) J.J. Thomson

05/11/2024

Science

9th

Structure Of The Atoms

Elements with valency 1 are
(a) always metals
(b) always metalloids
(c) either metals or non-metals
(d) always non-metals

05/11/2024

Science

9th

Structure Of The Atoms

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?
(a) 13
(b) 10
(c) 14
(d) 16

05/11/2024

Science

9th