Question 1

In the third excited state, the number of unpaired electrons in chlorine atom is:

Accepted Answer

The general electronic configuration of chlorine is  [Ne] 3s^{2} 3p^{5} .When electrons are excited in chlorine, the electrons enter into 3d subshell then the electronic configuration of chlorine is given as: [Ne] 3s^{1} 3p^{3} 3d^{3} Thus the number of unpaired electrons will be 7.

Question 2

If a new noble gas is discovered then, what will be its atomic number?

Accepted Answer

Rn+32 = 86+ 32 = 118 The atomic number of next inert gas to be discovered will be  118 .

Question 3

The elements with atomic numbers  2, 10, 18, 36, 54  and  86  are collectively known as:

Accepted Answer

Zero group of Mendeleev's periodic table or the group  18  of long form of periodic table is comprised of six elements and these eleements are called as inert gases as trhese elements do not react (inert) with other elements due to their octet outer electronic configaration which is stable configaration. The electronic configuration is listed in the following table.          S.No   Element    Symbol  Atomic no. Electronic  configuration1    Helium    He   2   1s ^2 2    Neon    Ne   10   [He] 2s ^2 2p ^6 3    Argon    Ar   18   [Ne] 3s ^2 3p ^6             4    Krypton    Kr   36               [Ar] 3d ^{10} 4s ^2 4p ^6                                             5    Xenon    Xe   54               [Kr] 4d ^{10} 5s ^2 5p ^6                       6    Radon    Rn    86   [Xe] 4f ^{14} 5d ^{10} 6s ^2 6p ^6

Question 4

Which of the following electronic configuration corresponds to an inert gas?

Accepted Answer

Noble gases have full-filled configuration i.e the subshell are completely filled.They have the general electronic configuration as  ns^2 np^6 . Thus option B represents a noble gas.

Question 5

Mono atomic element among the following is:

Accepted Answer

Oxygen is diatomic gas.  Phosphorous is tetra atomic.Sulphur is polyatomic.Whereas being an inert gas, Krypton is monoatomic.

Question 6

The inert gas atom in which the total number of d-electrons is equal to the difference in numbers of total  p-  and  s- electrons, is:

Accepted Answer

He, Ne  and  Ar  do not have any  d  electrons, while the difference of their  s  and  p  electrons is not zero. The electronic configuration of krypton (atomic number is 36) is:  1s^2,2s^2,2p^6,3s^2,3p^6,3d^{10},4s^2,4p^6 .Total  s- electrons are 8 and total  p- electrons are 18.Thus, the difference is 10 and total d-electrons are 10 which are equal.So, option  D  is correct answer.

Question 7

Elements with atomic numbers 9, 17, 35, 53 are collectively known as:

Accepted Answer

Elements having the atomic number:9 is fluorine:  (He)2s^22p^5 17 is chlorine:  (Ne)3s^23p^5 35 is bromine:  (Ar)4s^24p^5 53 is iodine:  (Kr)5s^25p^5 We can observe here that all these elements having the general electronic configuration of  ns^2np^5 , hence these elements belong to  17^{th}  group elements.

Question 8

Which of the following halogens does not form oxyacids at room temperature?

Accepted Answer

Fluorine does not hove d-sub shell so it can only have one oxidation state. Therefore, it cann't form oxy acids. Fluorine is the most electronegative element and always show  -1  oxiadation state. In oxyacids. reast of the halogens have positive oxidation state.

Question 9

According to Coulson the high reactivity of fluorine than other halogens is because of its:

Accepted Answer

According to Coulson, since fluorine atoms are small it's intermolecular repulsion is appreciable. The large electron-electron repulsion between the lone pairs of electrons on the fluorine atom weakens the bond.

Question 10

The inert gas present in the second long period is:

Accepted Answer

Periods  4  and  5  are called long periods as they contain  18  elements each.  4 th period is called the first long period and the inert gas in this period is  Kr . 5 th period is the second long period where  Xe  is the inert gas element.

The P Block Elements

Chemistry
1918 Views

In the third excited state, the number of unpaired electrons in chlorine atom is:

If a new noble gas is discovered then, what will be its atomic number?

The elements with atomic numbers $2, 10, 18, 36, 54$ and $86$ are collectively known as:

Which of the following electronic configuration corresponds to an inert gas?

Mono atomic element among the following is:

The inert gas atom in which the total number of d-electrons is equal to the difference in numbers of total $p -$ and $s -$ electrons, is:

Elements with atomic numbers 9, 17, 35, 53 are collectively known as:

Which of the following halogens does not form oxyacids at room temperature?

According to Coulson the high reactivity of fluorine than other halogens is because of its:

The inert gas present in the second long period is:

The P Block Elements

Chemistry 1918 Views

In the third excited state, the number of unpaired electrons in chlorine atom is:

If a new noble gas is discovered then, what will be its atomic number?

The elements with atomic numbers 2,10,18,36,54 and 86 are collectively known as:

Which of the following electronic configuration corresponds to an inert gas?

Mono atomic element among the following is:

The inert gas atom in which the total number of d-electrons is equal to the difference in numbers of total p− and s−electrons, is:

Elements with atomic numbers 9, 17, 35, 53 are collectively known as:

Which of the following halogens does not form oxyacids at room temperature?

According to Coulson the high reactivity of fluorine than other halogens is because of its:

The inert gas present in the second long period is:

Chemistry
1918 Views

The elements with atomic numbers $2, 10, 18, 36, 54$ and $86$ are collectively known as:

The inert gas atom in which the total number of d-electrons is equal to the difference in numbers of total $p -$ and $s -$ electrons, is: