INTERNATIONAL INDIAN SCHOOL, RIYADH SA

INTERNATIONAL INDIAN SCHOOL, RIYADH
SA-II WORKSHEET
GRADE-X – CHEMISTRY
Chapter:-Periodic classification of elements
1. An element ‘X’ is in second period and group 16 of the periodic table.
1) Is it a metal or a non-metal?
2) What is the valency
3) What will be the formula of the compound of ‘X’ with Na.?
4) What is the name of the element?
2. An element ‘X’ belongs to the Second group of the periodic
table. What is the formula of its chloride and oxide?
3.Table given below shows a part of the periodic table.
H
He
Li
Be
B
C
N
O
F
Ne
Na
Mg
Al
Si
P
S
Cl
Ar
Using this table explain why
(a) Li and Na are considered as active metals
(b) Atomic size of Mg is less than that of Na
(c) Fluorine is more reactive than chlorine
4. An element belongs to 4th period and group 17 of the periodic
table. Find out
1) The number of valence electrons
2) Is it a metal or non-metal
3) name the element
4) Formula of its compound with hydrogen
5) electron dot structure of this element with calcium
5.(i) What is the position of hydrogen in the modern periodic table?
(ii) Where are isotopes of the same element having different atomic masses
placed in the periodic table?
1 |I I S R W o r k s h e e t s / X / S A 2 / C h e m i s t r y / 2 0 1 4 ‐ 2 0 1 5 6. How would the following properties of the element vary along the
Period from left to right in the modern periodic table. Give reason.
(1)Tendency to lose electrons
(2) Atomic size
(3)valency
7. How many groups and periods are there in modern periodic table. Justify
the placement of oxygen(At No.8) Sulphur (At No.16) and selenium (At
No.34) in the same group which of thee elements are present in ores to
maximum extent?
8.(i)Magnesium Oxide is MgO. What is the formula of Magnesiuim
hydroxide and Magnesium sulphate?
(ii)Which is more reactive Mg or Ca and Why?
9. (a) Flurine is more reactive than chlorine why?
(b) Ne has zero valency. Why?
(c)Mg is more metallic than Be .Why?
10. ‘A’ and ‘B’ belong to group 2 and 13 respectively in 2nd period.
(a) Which of them is smaller
(b)Which of them can lose electron easily
( c) Give formula of their oxides and chlorides.
11.Two elements X and Y belong to group 2 respectively in the same period
of the periodic table. Compare them with respect to
(i)
(ii)
(iii)
(iv)
(v)
The number of valence electrons in their atoms
Their valencies
Metallic character
The size of their atoms
The formula of their oxides and chlorides.
12. The elements of the third period of the periodic table are given below.
Group
I
II
III
IV
V
VI
VII
Period
Na
Mg
Al
Si
P
S
Cl
(a) Which atom is bigger, Na or Mg? Why?
(b) Identify the most metallic and non-metallic element in period 3
13. The atomic numbers of three elements A,B,C are given below.
Element
Atomic Number
A
5
B
7
C
10
2 |I I S R W o r k s h e e t s / X / S A 2 / C h e m i s t r y / 2 0 1 4 ‐ 2 0 1 5 (a)Which element belong to group 18
(b) Which element belong to group 15
(c)Which element belong to group 13
(d) To which periods do these elements belong?
14. (i) Which can lose electrons easily? K or Na? Why?
(ii) Which can gain electron easily O or F? Why?
15.Compare the radii of two species X and Y .Give reasons for your answer.
( a) X has 12 protons and 12 electrons
( b) Y has 12 protons and 10 electrons
16. Write the formula of the product formed when the element A( At No.19)
Combines with the element B(At No17) . Draw its electron dot structure.
What is the nature of the bond formed.
17. Arrange the following elements in increasing order of their atomic radii
(a) Li , Be, F, N
(b) Cl, At, Br, I
3 |I I S R W o r k s h e e t s / X / S A 2 / C h e m i s t r y / 2 0 1 4 ‐ 2 0 1 5