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

1.

How many electrons will be there in the valence she'll of O2- .

a.

2

 b.

8

 c.

10

 d.

16

 e.

0
2.
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
3.
What is the basic difference in approach between the Mendeleev’s Periodic Law and the Modern Periodic Law?
4.
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 $J mol^{-1}$.
5.
Describe the theory associated with the radius of an atom as it (b) loses an electron
6.
Would you expect the first ionization enthalpies for two isotopes of the same element to be the same or different? Justify your answer.
7.
Why do elements in the same group have similar physical and chemical properties?
8.
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.
9.
Write the general outer electronic configuration of $s$-, $p$-, $d$- and $f$- block elements.
10.
Among the second period elements the actual ionization enthalpies are in the order $Li < B < Be < C < O < N < F < Ne$. Explain why (ii) $O$ has lower $\Delta_{i} H$ than $N$ and $F$?
11.
What are the major differences between metals and non-metals?
12.
What does atomic radius and ionic radius really mean to you?
13.
Considering the elements $B$, $C$, $N$, $F$, and $Si$, the correct order of their non-metallic character is :
a. $B > C > Si > N > F$ b. $Si > C > B > N > F$ c. $F > N > C > B > Si$ d. $F > N > C > Si > B$
14.
What is the basic theme of organisation in the periodic table?
15.
Write the atomic number of the element present in the third period and seventeenth group of the periodic table.
16.
Consider the following species : $N^{3-}$, $O^{2-}$, $F^{-}$, $Na^{+}$, $Mg^{2+}$ and $Al^{3+}$ (a) What is common in them?
17.
Predict the formulas of the stable binary compounds that would be formed by the combination of the following pairs of elements. (b) Magnesium and nitrogen
18.
Which important property did Mendeleev use to classify the elements in his periodic table and did he stick to that?
19.
Assign the position of the element having outer electronic configuration (iii) $(n-2) f^{7} (n-1)d^{1}ns^{2}$ for $n=6$, in the periodic table.
20.
What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions. (iv) $Rb^{+}$

Worksheet Answers

1.
Option B

Solution:

Oxygen has the electronic configuration of 1s2,2s2,2p4.when it becomes O2- charged the valence p orbital gets 2p6 configuration.Thus the valence shell  will occupy  total 8 electrons.

13.
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