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CBSE - Class 9 Science Structure of the Atom Worksheet

For the following statements, write T for True and F for False.
(c) The mass of an electron is about $\frac{1}{2000}$ times that of proton.

$Na^+$ has completely filled $K$ and $L$ shells. Explain.

Complete the following table.

Number of valence electrons in Cl ionis

Which one of the following is a correct electronic configuration of sodium?

a. (a) 2,8 b. (b) 8,2,1 c. (c) 2,1,8 d. (d) 2,8,1.

For the following statements, write T for True and F for False.
(d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.

Explain with examples iv) Isobars. Give any two uses of isotopes.

What are the limitations of J.J. Thomson’s model of the atom?

Rutherford’s alpha-particle scattering experiment was responsible for the discovery of

Atomic Nucleus

Electron

Proton

Neutron

Isotopes of an element have

the same physical properties

different chemical properties

different number of neutrons

different atomic numbers.

10.

Compare the properties of electrons, protons and neutrons.

11.

If $Z = 3$, what would be the valency of the element? Also, name the element.

12.

Composition of the nuclei of two atomic species $X$ and $Y$ are given as under

Give the mass numbers of $X$ and $Y$. What is the relation between the two species?

13.

For the following statements, write T for True and F for False.
(a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

14.

For the following statements, write T for True and F for False.
(b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.

15.

Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.

16.

Compare all the proposed models of an atom given in this chapter.

17.

Describe Bohr’s model of the atom.

18.

What are the limitations of Rutherford’s model of the atom?

19.

Explain with examples (i) Atomic number. Give any two uses of isotopes.

20.

Define valency by taking examples of silicon and oxygen.

Worksheet Answers

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