A scientist made the following contributions in the development of the Periodic Table.
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  • Johan W. Dobereiner
  • John Newlands
  • Lothar Meyer
  • Dmitri Mendeleev
Element M is placed in Group 14 and Period 3 of the Periodic Table. What is the electron arrangement of an atom M?
  • 2.3
  • 2.4
  • 2.8.3
  • 2.8.4

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  • M, G, J, L
  • G, M, L, J
  • G, J, L, M
  • M, L, J, G
Table 2 shows the relative atomic masses and number of neutrons for the elements G and J. G and J are not the actual symbols of the elements.Which of the following statements are true about these elements?I Element G is more reactive than element J.II Atoms G and J have two valence electrons.III Elements G and J are in the same group in the Periodic Table.IV Elements G and J can conduct electricity.
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  • I and II
  • I and III
  • II and IV
  • III and IV
An atom Y with nucleon number of 23 has 12 neutrons. Which element has the same chemical properties as element Y?[Proton number: B = 5, Mg = 12, Cl = 17, K = 19]
  • Boron
  • Magnesium
  • Chlorine
  • Potassium
Neon gas is used to provide an inert atmosphere for welding. Which of the following explains this property of neon?
  • It has a stable electronarrangement
  • It is placed in Group 18 of thePeriodic Table
  • It exists as monoatomic gas
  • It has low melting and boilingpoints
Element R is located in the same group as lithium in the Periodic Table of Element. Which of the following are the properties of R?
  • Diatomic particle
  • Reacts vigorously with water
  • Cannot conduct electricity
  • High melting and boiling points
An atom of element T has an electron arrangement of 2.8.8.An atom of element W has 4 neutrons and relative atomic mass ofWhich of the following statements is true about elements T and W?
  • Element W is more reactive than element T.
  • Melting point of element W is lower than element T.
  • Reaction of element W with water is less vigorous than that of element T.
  • Density of element W is higher than that of element T.
Element G, J, and L are located in Group 17 of the Periodic Table. Atomic radius of element J is the smallest. In an experiment, when vapour L is passed over hot iron wool, the iron wool glows brightly. When vapour G is passed over hot iron wool, the iron wool glows dimly. The reactivity of elements G, J, and L in ascending order is ...
  • L, G, J
  • G, L, J
  • G, J, L
  • J, L, G
Table 3 shows the nucleon number and number of neutrons for elements W, X, Y and Z.
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  • W
  • X
  • Y
  • Z
Which property is similar for chlorine, bromine, iodine and astatine in Group 17 of the Periodic Table?I Reacts with water to form an acidic solution.II Reacts with sodium hydroxide solution to form two salts.III Exist as solid at room temperature.IV All are good bleaching agents.
  • I and II
  • I and III
  • II and IV
  • III and IV
Which characteristic is correct for the elements according to the sequence as shown below?
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  • Solubility in water increases
  • Reactivity increases
  • Electrical conductivity increases
  • The strength to accept an electron decreases
Which statement explains the following information?
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  • Boiling points of the elements increase.
  • Intermolecular forces of attraction become stronger.
  • The valence shell gets further away from the nucleus.
  • The attractive force between the valence electrons and the nucleus becomes stronger.
Table 4 shows the relative charge of nucleus of atoms G, J, and M. Which of the following about elements G, J, and M is true?
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  • The atomic size of element G is bigger than element J.
  • Element M cannot combine with element J to form a compound.
  • Element G is more reactive than element M.
  • Element G is less electronegative than element M.
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