Explain the following sequence of IE's in group IIIA. `B(801), Al(577), Ga(579), In(558), Tl(589) kJmol^(-1)`.

Explain the following sequence of IE's in group IIIA. B(801), Al(577), Ga(579), In(558), TI(589) kJ "mol"^(-1)1 .

How many of the following are non - metals B, Al, Ga, In, Tl, C, Si, Ge, Sn, Pb.

The first ionization enthalpy values (in kJ mol^(-1) ) of group 13 elements are: {:(B,Al,Ga,In,Ti),(801,577,579,558,589):} How do you explain this deviation from the general trend?

Numerous forms of the periodic table have been devised from time to time. A modern version which is most convenient and widely used is the long or extended from of periodic table. The aufbau principle and the electronic configuration of atoms provide a theoretical foundation for the periodic classification. The horizontal rows are called periods. There are altogether seven periods. The first period consists of 2 elements. The subsequent periods consists of 8, 8,18, 18 and 32 elements respectively. The seventh period is incomplete and like the sixth period would have maximum of 32 elements. Elements having similar outer electronic configurations in their atoms are grouped in vertical columns. These are referred to as groups or families. According to the recommendations of IUPAC, the groups are numbered 1 to 18 replacing the older notation of groups 0, IA, IIA, ....VIIA, VIII, IB.....VIIB. Each successive period in the periodic table is associated with the filling up next higher principal energy level following aufbau sequence. The number of elements in each period is twice the number of atomic orbitals available in the energy level that is being filled. All the elements are classified into four blocks, i.e., s-block, p-block, d-block, and f-block depending on the type of atomic orbitals that are being filled with electrons. Elements A, B, C, D and E have the following electronic configuration: (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 Which among these will belong to same group in the periodic table ?

Which of the following statements is/are correct for group 13 elements ? A. Al reacts with dil. HCl to liberate H_(2) gas B. Al reacts with conc. HNO_(3) to liberate H_(2) gas C. Boron reacts with only acids to liberate H_(2) gas D. Anhydrous AlCl_(3) reacts with moisture to liberate H_(2) gas

Which of the following group represent the correct sequence of steps in respiration A.Breathing to Gaseous exchange at lungs to Gaseous exchange at tissue level to Gas transport by blood to Cellular respiration . B. Breathing to Gaseous exchange at lungs to Gas transport by blood to Gaseous exchange at tissue level to Cellular respiration .

Numerous forms of the periodic table have been devised from time to time. A modern version which is most convenient and widely used is the long or extended from of periodic table. The aufbau principle and the electronic configuration of atoms provide a theoretical foundation for the periodic classification. The horizontal rows are called periods. There are altogether seven periods. The first period consists of 2 elements. The subsequent periods consists of 8, 8,18, 18 and 32 elements respectively. The seventh period is incomplete and like the sixth period would have maximum of 32 elements. Elements having similar outer electronic configurations in their atoms are grouped in vertical columns. These are referred to as groups or families. According to the recommendations of IUPAC, the groups are numbered 1 to 18 replacing the older notation of groups 0, IA, IIA, ....VIIA, VIII, IB.....VIIB. Each successive period in the periodic table is associated with the filling up next higher principal energy level following aufbau sequence. The number of elements in each period is twice the number of atomic orbitals available in the energy level that is being filled. All the elements are classified into four blocks, i.e., s-block, p-block, d-block, and f-block depending on the type of atomic orbitals that are being filled with electrons. What is the position of the element in the periodic table satisfying the electronic configuration (n-1)d^1 ns^2 for n=4 ?