CLASS: X-SCIENCE
CHAPTER: PERIODIC CLASSIFICATION OF ELEMENTS
SAMPLE
PAPERS
MAXIMUM
TIME: 35 MINUTES
MAXIMUM MARKS: 25 MARKS
1. An
element X belongs to group 1 and 3 period.
a.
Give its electronic configuration
b.
Formula when it combines with oxygen
c.
State its nature (3)
2. An
element to 3rd period and 17th group of the periodic table, find out
a.
The electronic configuration of element on its left and right
b.
Its valence electrons
c.
Its size with in composition with neighboring elements (3)
3. State
some characteristics of periodic table. (3)
4. Define
atomic size? (1)
5. Name
two isotopes of carbon. (1)
6. Name
any two alkali present in group1. (1)
7. An
element X belongs to II group and 2nd period. Write the atomic number and name
of element. (3)
8. The
atomic number of X is 17, predict its
a.
Valency
b.
Formula of its halide
c.
Type of ion formed
d.
Reactivity with respect to the other of same group (3)
9. What
happens to the valence electrons and valency as we move to left to right in a
period and top to bottom in a period? (3)
10. Name
the following elements
a.
Two shells both of which are completely filled
b.
Three shells with 2 valence electrons
c.
Metals with valency 3, group number 13 and period 3. (3)
11. An
element X from group 1 combines with an element Y from group 17 to form a
compound. Both X and Y belongs to period II.
a.
Give the formula of the compound formed
b.
Will the compound be ionic or covalent
c.
Give its electrons dot structure. (3).
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