Upto which element, the Law of Octaves was found to be applicable
Oxygen
Calcium
Cobalt
Potassium
According to Mendeleev’s Periodic Law, the elements were arranged in the periodic table in the order of
increasing atomic number
decreasing atomic number
increasing atomic masses
decreasing atomic masses
In Mendeleev’s Periodic Table, gaps were left for the elements to be discovered later. Which of the following elements found a place in the periodic table later
Germanium
Chlorine
Oxygen
Silicon
Which of the following statement(s) about the Modern Periodic Table are incorrect
(i) The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number
(ii) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses
(iii) Isotopes are placed in adjoining group(s) in the Periodic Table
(iv) The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number
(i) only
(i), (ii) and (iii)
(i), (ii) and (iv)
(iv) only
Which of the following statements about the Modern Periodic Table is correct:
It has 18 horizontal rows known as Periods
It has 7 vertical columns known as Periods
It has 18 vertical columns known as Groups
It has 7 horizontal rows known as Groups
Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
A, B, C
B, C, D
A, D, E
B, D, E
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
A and B
B and D
A and C
D and E
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Group 8
Group 2
Group 18
Group 10
An element which is an essential constituent of all organic compounds belongs to
group 1
group 14
group 15
group 16
Which of the following is the outermost shell for elements of period 2?
K shell
L shell
M shell
N shell
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
Which among the following elements has the largest atomic radii?
Na
Mg
K
Ca
Which of the following elements would lose an electron easily?
Mg
Na
K
Ca
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?
(i) Isotopes of an element have same atomic masses
(ii) Isotopes of an element have same atomic number
(iii) Isotopes of an element show same physical properties
(iv) Isotopes of an element show same chemical properties
(i), (iii) and (iv)
(ii), (iii) and (iv)
(ii) and (iii)
(ii) and (iv)
Arrange the following elements in the order of their decreasing metallic character: Na, Si, Cl, Mg, Al
Cl > Si > Al > Mg > Na
Na > Mg > Al > Si > Cl
Na > Al > Mg > Cl > Si
Al > Na > Si > Ca > Mg
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 Eka-aluminium form?
EO₃
E₃O₂
E₂O₃
EO
Three elements B, Si and Ge are
metals
non-metals
metalloids
metal, non-metal and metalloid respectively
Which of the following elements will form an acidic oxide?
An element with atomic number 7
An element with atomic number 3
An element with atomic number 12
An element with atomic number 19
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
Which one of the following depict the correct representation of atomic radius (r) of an atom?
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)
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
Which of the following set of elements is written in order of their increasing metallic character?
Be < Mg < Ca
Na < Li < K
Mg < Al < Si
C < O < N