NEW
Font size
WorksheetsPeriodic classification of elements
Total questions: 25
Worksheet time: 13mins
Upto which element, the Law of Octaves was found applicable?
CALCIUM
MAGNESIUM
ALUMINIUM
POTASSIUM
Select the correct arrangement of following elements in doberieners triads Sr, K, Ca, Br, Na, Ba, Cl, I, Li
i) Li Sr K ii) Ca Na Ba iii) Cl Br I
i) Li Na K ii) Ca Sr I iii) Cl Br Ba
i) Li Na K ii) Ca Sr Ba iii) Cl Br I
i) Ca Na K ii) Li Sr Ba iii) Cl Br I
At the time of Mendeleev, the number of elements known was
62
61
63
56
An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong?
4th group
2nd group
3rd group
6th group
Which of the following belong to same period?
Element A B C D E
Atomic No 3 2 14 9 6
DEA
BCD
ABC
ADE
Pick out the chemically most reactive elements from the given set of elements
Li, Na, K F, Cl, Br
Li and F
Li and Br
Na and Cl
K and F
Which one of the following statements is not correct about the trends in the properties of the elements of a period on going from left to right?
oxides become more acidic
the atom gains electrons readily
the element becomes more metallic
there is increase in no of valence electrons
A metal ‘M’ is in the first group of the Periodic Table. What will be the formula of its oxide?
MO
M2O
MO2
M2O3
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 3
Group 2
Group 4
An element ‘A’ belongs to the third period and group 16 of the Periodic Table. Find out the valency of A.
Valency = 1
Valency = 2
Valency = 3
Valency = 6
Which of the following set of elements are arranged in increasing order of metallic character?
Be Mg Si
Li Na K
Cl Br I
K Na Rb
Which of the following set of elements are arranged in increasing order of non metallic character?
F, Cl ,Br
Br, Cl ,F
Cl, F, Br
Br, F ,Cl
Halogens belong to __________ group of periodic table
12
13
17
18
Electronegative character ________ down the group
increases
decreases
no change
Non metals are situated on the _____________ side of the periodic table.
left
right
centre
Which one of the following does not increase while moving down the group of the periodic table?
Atomic radius
Metallic character
Valency
Number of shells in an element.
Choose the correct statement from the following:
Mendeleev considered oxides and halides made by elements as criteria for classification
Newland's law of octaves was valid upto the element vanadium
Doberieneer could identify only 5 triads
modern periodic table removed the anomaly of position of isotopes
Pick out the chemically most reactive elements from the given triads.Li, Na, K F, Cl, Br
(a) Li and F
(b) Li and Br
(c) K and F
(d) K and Br
Newlands relation is called
a) Musical Law
(b) Law of Octaves
(c) Periodic Law
(d) Atomic Mass Law
Pick out the chemically most reactive elements from the given triads.
(a) Li and F
(b) Li and Br
(c) K and F
(d) K and Br
Up to which element,law of octaves found to be applicable
Oxygen
Calcium
Cobalt
Potassium
Which one of the following elements do not constitute a Doebereiner's triad ?
Cl,Br, I
Li,Na,K
S,Se,Te
N,P,As
The most significant contribution towards the development of periodic table was made by
Mendeleev.
Avogadro.
Dalton.
Cavendish.
The number of elements known at present is ___.
31
114
63
75
Law of Triads was referred to as ___ relationship.
Lothar Meyer's
Mendeleev's
Newlands's
Dobereiner's
