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Worksheetsg-9 periodic classification of elements (t-2)
Total questions: 10
Worksheet time: 5mins
At the time of Mendeleev, the number of elements known was
(a) 63
(b) 65
(c) 62
(d) 64
The properties of eka-aluminium predicted by Mendeleev are the same as the properties of later discovered element
(a) Scandium
(b) Germanium
(c) Gallium
(d) Aluminium
An atom of an element has the electronic confi-guration 2,8,2. To which group does it belong?
(a) 4th group
(b) 6th group
(c) 3rd group
(d) 2nd group
Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?
(a) Group 8
(b) Group 2
(c) Group 18
(d) Group 10
Carbon belongs to the second period and Group 14. Silicon belongs to the third period and Group 14. If atomic number of carbon is 6, the atomic number of silicon is
(a) 7
(b) 14
(c) 24
(d) 16
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
EKABORON , EKA ALUMINIUM AND EKA SILICON REPRESENT WHICH OF THE FOLLOWING SETS OF ELEMENTS?
SCANDIUM,GALLIUM,GERMANIUM
GERMANIUM, SCANDIUM,GALLIUM,
GALLIUM,SCANDIUM ,GERMANIUM
GALLIUM,GERMANIUM, SCANDIUM
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
Halogens belong to __________ group of periodic table
12
13
17
18
Non metals are situated on the _____________ side of the periodic table.
left
right
centre
