THE PERIODIC TABLE AND ITS CLASSIFICATION
1.)
2.)
3.)
What is the Period in periodic table ?
What do you mean by Alkali Metals ?
Name the element that has the properties of both a metal and
a non-metal.
4.)
Name the Group that elements in the periodic table is called noble
gases.
5.)
6.)
7.)
What are transition elements?
Define periodic law.
Mention the main difference between Mendeleev’s periodic table
and Modern periodic table.
8.) How many valence electrons are available in Group VI elements ?
9.) Give the importance of Group and Period in the Periodic Table.
10.) An element with the electronic configuration (2, 8, 8,1). Name the
group and period of this element.
11.) An element has the proton number 16. Name the group and period
of this element.
12.)
What do you can predict about element if the atomic number or
electronic configuration of an element is given ?
13.) What type of compounds formed by the elements that loose electrons ?
14.) Name the elements that form Negative Ions .
15.) Name the periodic properties of elements .
16.) Atomic size of elements gradually decreases across a period. Give
reason.
17.) Define Ionisation Potential.
18.) Name the element that is least electronegative.
19.) Name the element having highest Ionisation Potential.
20.) What do you mean by Electron Affinity ?
21.) What is the trend of atomic size in a period and in a group?
22.) Which group elements have good oxidizing capacity ?
23.) Give three differences between metal and non-metal.
24.) Name the non-metal which is liquid in state.
25.) Name the metal that is best conductor of electricity.
26.) The elements of same group have similar chemical properties. Give
reason.
27.) Noble gases are chemically unreactive. Why ?
28.) In A modern Periodic Table:
a) What is the link between an element’s electronic configuration and the
Group it is in?
b) Describe how the elements are arranged in the modern Periodic Table in
terms of atomic number.
c) Name the most reactive non-metal.
d) Name the element which consists of diatomic molecules and constitutes
78% of air.
e) Name the element in Period 2 that forms an ion of the type X+
f) Name the element in Period 2 which has four electrons available for
bonding.
29.) a.) Name the Period 3 elements which are good conductors of electricity.
b.)) An element X, in Period 3, reacts with oxygen to give an ionic compound
with the formula X0. Identify the element X.
c.) An element Y, in Period 3, burns in air on gentle heating to produce a
colourless gas with the formula Y02. Identify the element Y.
Objective Questions:
Choose the correct answer from the options given below each of the following questions.
1. Which of the following elements has the smallest atomic size?
(a) H
(b) Li
(c) Na
(d) K
2. Which of the following species should have the largest size?
(a) F
(b) C1
(c) Br
(d) Br
3. From which of the following species can we remove an electron most easily?
(a) M
(b) M+
(c) M2+
(d) M3+
4. Among the following elements, which has the highest ionization energy?
(a) F
(b) C1
(c) Br
(d) I
5. Which of the period 2 elements has the highest electron affinity?
(a) Li
(b) C
(c) F
(d) Ne
6. Which of the following elements is the most electropositive?
(a) Na
(b) K
(c) Cs
(d) C
7. Which of the following elements ® will form a binary compound of the type RH3?
(a) F
(b) C1
(c) O
(d) N
8. How do the following properties of elements change on moving from left to right in a
period of the periodic table?
(i)
Atomic size
(a) Decreases
(b) Increases
(b) Remains the same
(d) sometimes increases and sometimes decreases
(ii)
The ionization energy (ionization potential)
(a) Goes up and down
(b) decreases
(c) increases
(iii)
The electron affinity of elements from group I to VII (1, 2 and 13 to 17)
(a) Goes up and then down (b) decreases and then increases
(c) increases
(iv)
(d) remains the same
(d) decreases
Electronegativity
(a) Depends on the number of electrons
(c) decreases
(v)
(b) remains the same
(d) increases
The nonmetallic character of elements
(a) Decreases
(b) increases
(c) remains the same
(d) depends on the period
9. With reference to variation of properties in the periodic table, which of the following is
generally true?
(a) Atomic size increases from left to right across a period.
(b) Ionisation potential increases from left to right across a period.
(c) Electron affinity increases on going down a group.
(d) Electronegativity increases on going down a group.
Fill in the blanks using the appropriate option(s) given within brackets.
1. On moving down a group, the number of valence electrons …… .
(remains the same, increases, decreases)
2. On moving from left to right in a given period, the number of shells ….. .
(remains the same, increases, decreases)
3. The properties of elements in a group are similar because they have the same ….. .
(electronic configuration, number of outer electrons, atomic number)
4. The radius of a cation is ….. the atomic radius of the corresponding elements.
(the same as, smaller than, larger
than)
5. Atomic size ….. as we move from left to right across a period, because ….. increases but
….. remains the same.
(atomic number, decreases, outer-sell)
6. If an element has seven electrons in its outermost shell then it is likely to have the …..
atomic size among all the elements in the same period.
(largest / smallest)
7. Atomic size ….. down a group as the number of shells ….. at each step.(decreases,
increases)
8. In general, the larger the atomic size, the ….. is the ionization energy.
(largest , smaller)
9. The element above chlorine (in the periodic table) would be expected to have a …..
ionization potential than chlorine.
(lower, higher)
10. Oxygen has a ……. Ionization energy than nitrogen.
(higher, lower)
11. The element below sodium in the same group (of the periodic table) would be expected to
have a ….. electronegativity than sodium.
(lower,
higher)
12. If an element has one electron in its outermost energy level (shell), it is likely to be….. .
(metallic, nonmetallic)
13. Moving across a ….. the elements show increasing ….. character.
(group, period, metallic non metallic)
14. The element at the bottom of a group is expected to show ….. metallic character than the
element at the top.
(less, more)
15. If an element has a low ionization energy then it is likely to be ……
(metallic,
nonmetallic)