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CBSE - Class 11 Chemistry Classification of Elements and Periodicity in Properties Worksheet

1.
What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions. (iv) $Rb^{+}$
2.
The size of isoelectronic species — $F^{-}$, $Ne$ and $Na^{+}$ is affected by
a. nuclear charge ($Z$) b. valence principal quantum number ($n$) c. electron-electron interaction in the outer orbitals d. none of the factors because their size is the same.
3.
Write the general outer electronic configuration of $s$-, $p$-, $d$- and $f$- block elements.
4.

Allotropes can be best defined as ,

a.

A pair of substances differ by H+

 b.

Elements showing properties between metals and nonmetals

 c.

Atoms of a given atomic number that have specific number of neutrons

 d.

Different structural forms of an element

 e.

The different phases of a substance (gas,liquid or solid)
5.
What is the significance of the terms — ‘isolated gaseous atom’ and ‘ground state’ while defining the ionization enthalpy and electron gain enthalpy?
6.
In terms of period and group where would you locate the element with $Z =114$?
7.
The increasing order of reactivity among group 1 elements is $Li < Na < K < Rb < Cs$ whereas that among group 17 elements is $F > Cl > Br > I$. Explain.
8.
Energy of an electron in the ground state of the hydrogen atom is $-2.18 imes 10^{-18}J$. Calculate the ionization enthalpy of atomic hydrogen in terms of $J mol^{-1}$.
9.
Predict the formulas of the stable binary compounds that would be formed by the combination of the following pairs of elements. (f) Element 71 and fluorine
10.
On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.
11.
Consider the following species : $N^{3-}$, $O^{2-}$, $F^{-}$, $Na^{+}$, $Mg^{2+}$ and $Al^{3+}$ (a) What is common in them?
12.
Among the second period elements the actual ionization enthalpies are in the order $Li < B < Be < C < O < N < F < Ne$. Explain why (i) $Be$ has higher $\Delta_{i} H$ than $B$
13.
In the modern periodic table, the period indicates the value of :
a. atomic number b. atomic mass c. principal quantum number d. azimuthal quantum number.
14.
The first ($\Delta_{i}H_{1}$) and the second ($\Delta_{i}H_{2}$) ionization enthalpies (in kJ $mol^{-1}$) and the ($\Delta_{eg}H$) electron gain enthalpy (in kJ $mol^{-1}$) of a few elements are given below:
Elements $\Delta H_{1}$ $\Delta H_{2}$ $\Delta_{eg}H$
I 520 7300 –60
II 419 3051 –48
III 1681 3374 –328
IV 1008 1846 –295
V 2372 5251 +48
VI 738 1451 –40
Which of the above elements is likely to be : (c) the most reactive non-metal.
15.
Write the atomic number of the element present in the third period and seventeenth group of the periodic table.
16.

Photoelectric effect explain by

a.

 Michael Faraday

 b.

Albert Einstein 

 c.

C. Gallileo

 d.

Clark maxwell
17.
Consider the following species : $N^{3-}$, $O^{2-}$, $F^{-}$, $Na^{+}$, $Mg^{2+}$ and $Al^{3+}$ (b) Arrange them in the order of increasing ionic radii.
18.
The first ($\Delta_{i}H_{1}$) and the second ($\Delta_{i}H_{2}$) ionization enthalpies (in kJ $mol^{-1}$) and the ($\Delta_{eg}H$) electron gain enthalpy (in kJ $mol^{-1}$) of a few elements are given below:
Elements $\Delta H_{1}$ $\Delta H_{2}$ $\Delta_{eg}H$
I 520 7300 –60
II 419 3051 –48
III 1681 3374 –328
IV 1008 1846 –295
V 2372 5251 +48
VI 738 1451 –40
Which of the above elements is likely to be : (a) the least reactive element.
19.

What will be the formula for a compound when magnesium is burnt in oxygen.

a.

MgO

 b.

Mg2O2

 c.

MgO2

 d.

Mg2O3

 e.

Mg2O
20.
Why do elements in the same group have similar physical and chemical properties?

Worksheet Answers

2.
4.
Option D

Solution:

Many physical forms of an element.For example : Carbon has allotropes like graphite,diamond and charcoal.

13.
16.
Option B

Solution:

He said when a suitable frequency of light incident on metal surface, which contain photon helps to increase the energy of electron to eject out from the metal surface, this minimum energy require to eject electron is called threshold energy, this eject photon+ electron called photoelectron, this phenomenon is called photoelectric effect🙏

19.
Option A

Solution:

Magnesium reacts with oxygen and forms magnesium oxide .

2Mg + O2 ----->2 MgO

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