Periodicity

Q.

what is the inert pair effect?

Q.

Arrange S, O and Se in ascending order of electron affinity

1. Se < S < O

2. Se < O < S

3. S < O < Se

4. S < Se < O

Q. 29. Which element has lowest electron affinity?g(1) O(2) S(3) Se(4) Te

Q. What is Inert Pair effect? Discuss the oxidation states of Group 13 elements in light of inert pair effect.

Q. Arrange in increasing order of (a). Size I, F, Cl, Br. (b). Oxidising power I, F, Br, Cl

Q.

Name the following:

A transition metal

Q. Electron affinity order from Lithium to Neon in period

Q. Decreasing order of first ionization energy is

1. N>P>As>Bi>Sb
2. N>P>As>Sb>Bi
3. N>P>As>Sb=Bi
4. N>P>Sb>As>Bi

Q. An unknown gas diffuses three times as low as hydrogen gas diffuses under identical conditions. Molecular mass of the unknown gas is

Q. What will be the IUPAC nomenclature of the element placed just below the element $At$.
Atomic number of At = 85

1. Ununennium
2. Ununhexium
3. Ununoctium
4. Ununseptium

Q. The correct order of the metalic character is:

1. $B>Al>Mg>K$
2. $Al>Mg>B>K$
3. $Mg>Al>K>B$
4. $K>Mg>Al>B$

Q. What is the electronic configuration of group 1 elements?

Q. Anything that influences the valence electrons will affect the chemistry of the element.which one of the following factors does not the valence shell? (a) valence principal quantum number (n) (b) Nuclear charge (Z) (c) Nuclear mass (d) Number of core electrons.

Q. What would be the IUPAC name and the symbol for an element having atomic number 140?

1. Untetranilium, Utn
2. Unquadnilium, Uqi
3. Unquadnilium, Uqn
4. Untetraunilium, Utn

Q. The electronic configuration of an element is $1s^2$ $2s^2$ $2p^6$ $3s^2$ $3p^4$. The atomic number and the group number of element 'X' (which is just below the said element in the periodic table) respectively are:

1. 24 & 6
2. 34 & 6
3. 24 & 16
4. 34 & 16

Q. Elements A, B, C, D and E have the following electronic configurations.
A : $1s^{2}2s^{2}2p^1$
B : $1s^{2}2s^{2}2p^{6}3s^{2}3p^1$
C : $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$
D : $1s^{2}2s^{2}2p^{6}3s^{2}3p^5$
E : $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^2$
Which among these will belong to the same group in the periodic table.

1. B and C
2. C and E
3. D and E
4. A and B

Q.

Which of these dose not reflect the periodicity of the elements

1. Bonding behaviour

2. Electronegativity

3. Ionization energy

4. Neutron/proton ratio

Q. Write the symbol and IUPAC name of the element with atomic number 117.

Q. Separation energy of a hydrogen like ion from its third excited state is 2.25 times the separation energy of
hydrogen atom from its first excited state. Final out the atomic number of hydrogen like ion.

Q. Elements A, B, C, D and E have the following electronic configurations.
A : $1s^{2}2s^{2}2p^1$
B : $1s^{2}2s^{2}2p^{6}3s^{2}3p^1$
C : $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$
D : $1s^{2}2s^{2}2p^{6}3s^{2}3p^5$
E : $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^2$
Which among these will belong to the same group in the periodic table.

1. B and C
2. C and E
3. D and E
4. A and B

Q. Among $A{l}_2{O}_3,Si{O}_2,P_2{O}_3$ and $S{O}_2$ the correct order of acid strength is:

1. $A{l}_2{O}_3<Si{O}_2<S{O}_2<P_2{O}_3$
2. $Si{O}_2<S{O}_2<A{l}_2{O}_3<P_2{O}_3$
3. $S{O}_2<P_2{O}_3<Si{O}_2<A{l}_2{O}_3$
4. $A{l}_2{O}_3<Si{O}_2<P_2{O}_3<S{O}_2$

Q.

aluminium shows +3 oxidation state in its compounds , but thallium shows +1 oxidation state

Q. Which oxidation state is observed to be more stable in group 14 elements with the increase in atomic number?

Q. Explain why stability of +1 oxidation state progressively increases for the heavier elements of group 13 ?

Q. the electron affinity Be is most similar to? how?

Q. Why the oxidation state of -3 of group 13 elements decrease down the group