classification of elements 11

Considering the elements F, Cl, O and N, the correct order of their chemical reactivity in terms of oxidizing property is:

• F > Cl > O > N

• F > O > Cl > N

• Cl > F > O > N

• O > F > N > Cl

Considering the elements B, C, N, F, and Si, the correct order of their non-metallic character is:

• Si > C > B > N > F

• F > N > C > B > Si

• F > N > C > Si > B

• B > C > Si > N > F

Considering the elements B, Al, Mg, and K, the correct order of their metallic character is:

• B > Al > Mg > K

• Al > Mg > B > K

• Mg > Al > K > B

• K > Mg > Al > B

Which one of the following statements is incorrect in relation to ionization enthalpy?

• Ionization enthalpy increases for each successive electron

• The greatest increase in ionization enthalpy is experienced on removal of electron from core noble gas configuration

• End of valence electrons is marked by a big jump in ionization enthalpy

• Removal of electron from orbitals bearing lower n value is easier than from orbital having higher n value.

The size of isoelectronic species — F – , Ne and Na+ is affected by

• Nuclear charge

• Valence principal quantum number (n)

• Electron-electron interaction in the outer orbitals

• None of the factors because their size is the same.

Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

• Valence principal quantum number (n)

• Nuclear charge (Z)

• Nuclear mass

• Number of core electrons.

Which of the following statements related to the modern periodic table is incorrect?

• The p-block has 6 columns, because a maximum of 6 electrons can occupy all the orbitals in a p-shell

• The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.

• Each block contains a number of columns equal to the number of electrons that can occupy that subshell.

• The block indicates value of azimuthal quantum number (l ) for the last subshell that received electrons in building up the electronic configuration.

In the modern periodic table, the period indicates the value of:

• Atomic number

• Atomic mass

• Principal quantum number

• Azimuthal quantum number.

when Mg reacts with N it form

• Mg3N

• MgN3

• Mg3N2

• Mg2N3

Li resembles in its properties with_______of 3rd period

• Na

• Mg

• Al

• K