Which one of the following does not increase while moving down the group of the periodic table?
  • Atomic radius
  • Metallic character
  • Valence
  • Number of shells in an element.
On moving from left to right in a period in the periodic table, the size of the atom
  • increases
  • decreases
  • does not change appreciably
  • first decreases and then increases.
An atom of an element has the electronic configuration 2, 8, To which group does it belong?
  • 4th group
  • 6th group
  • 3rd group
  • 2nd group
In modern periodic table, elements are arranged according to their
  • atomic weight
  • density
  • atomic number
  • melting point
In which group are inert elements placed? ‘
  • Group 8
  • Group 10
  • Group 1
  • Group 18
Which of the following sets of atomic number belong to that of alkali metals?
  • 1, 12, 30, 4, 62
  • 37, 19, 3, 55
  • 9, 17, 35, 53
  • 12, 20, 56, 88
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
  • Metal
  • Metalloid
  • Non-metal
  • Left-hand side element
The amount of energy released when one or more electrons is added to the neutral atom is
  • electron affinity
  • ionisation energy
  • electron negativity
  • atomicity
Arrange the following elements in the order of their increasing non-metallic character. Li, O, C, Be, F
  • F < O < C < Be < Li
  • Li < Be < C < O < F
  • F < O < C < Be < Li
  • F < O < Be < C < Li
What type of oxide would E&a-aluminium form?
  • EO
  • E
  • (i) and (ii)
  • None of the above
Which of these belong to the same period?
  • A, B
  • B, C
  • C, A
  • A, B & C
Which of the following property will be common in group 1 elements?
  • Mass number
  • Number of protons in nucleus
  • Atomic number
  • Number of valence electrons
Which one of the following elements exhibit maximum number of valence electrons?
  • Na
  • Al
  • Si
  • P
Which of the following gives the correct increasing order of the atomic radii of O, F and N?
  • O, F, N
  • N, F, O
  • O, N, F
  • F, O, N
Element ‘A’ has electronic configuration 2, 7; ‘B’ has electronic configuration 2, 8, 5 and ‘C’ has electronic configuration 2, 8, Which two elements will exhibit similar chemical properties?
  • A and C
  • A and B
  • B and C
  • None of these
Which of the following elements does not lose an electron easily?
  • Na
  • F
  • Mg
  • Al
Which of the following are the characteristics of isotopes of an element?
  • (ii), (iii) and (iv)
  • (i), (iii) and (iv)
  • (ii) and (iii)
  • (ii) and (iv)
An element-X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong?
  • Group 1
  • Group 4
  • Group 2
  • Group 3
Which of the following properties does not match element of the halogen family?
  • They have seven electrons in their valence shell.
  • They are highly reactive.
  • They are metallic in nature.
  • They are diatomic in their molecular form.
Upto which element, the Law of Octaves was found to be applicable.
  • Oxygen
  • Calcium
  • Cobalt
  • Potassium
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