List of Posts
This is the complete list of categories of posts written during Jun 2021. They have been ordered by the publish date, with the most recent first.
- Published: 01-Jun-2021The unpaired electrons in Al and Si are present in 3p orbital. Which electrons will experience more effective nuclear charge from the nucleus ?
- Published: 01-Jun-2021Indicate the number of unpaired electrons in : (a) P, (b) Si, (c) Cr, (d) Fe and (e) Kr.
- Published: 02-Jun-2021(a) How many subshells are associated with n = 4 ? (b) How many electrons will be present in the subshells having ms value of -1/2 for n = 4
- Published: 04-Jun-2021On the basis of quantum numbers, justify that the sixth period of the periodic table should have 32 elements.
- Published: 07-Jun-2021In terms of period and group where would you locate the element with Z =114?
- Published: 08-Jun-2021Write the atomic number of the element present in the third period and seventeenth group of the periodic table.
- Published: 09-Jun-2021How do atomic radius vary in a period and in a group? How do you explain the variation?
- Published: 11-Jun-2021Consider the following species : N3- , O2-, F- , Na+ , Mg2+ and Al3+ (a) What is common in them? (b) Arrange them in the order of increasing ionic radii.
- Published: 11-Jun-2021Explain why cation are smaller and anions larger in radii than their parent atoms?
- Published: 12-Jun-2021What is the significance of the terms — 'isolated gaseous atom' and 'ground state' while defining the ionization enthalpy and electron gain enthalpy?
- Published: 13-Jun-2021Among the second period elements the actual ionization enthalpies are in the order Li < B < Be < C < O < N < F < Ne. Explain why (i) Be has higher ∆i H than B (ii) O has lower ∆i H than N and F?
- Published: 14-Jun-2021How would you explain the fact that the first ionization enthalpy of sodium is lower than that of magnesium but its second ionization enthalpy is higher than that of magnesium?
- Published: 14-Jun-2021The first ionization enthalpy values (in kJ mol-1) of group 13 elements are : B Al Ga In Tl 801 577 579 558 589 How would you explain this deviation from the general trend ?
- Published: 15-Jun-2021Which of the following pairs of elements would have a more negative electron gain enthalpy? (i) O or F (ii) F or Cl
- Published: 16-Jun-2021Would you expect the second electron gain enthalpy of O as positive, more negative or less negative than the first? Justify your answer.
- Published: 18-Jun-2021What is the basic difference between the terms electron gain enthalpy and electronegativity?
- Published: 19-Jun-2021How would you react to the statement that the electronegativity of N on Pauling scale is 3.0 in all the nitrogen compounds?
- Published: 21-Jun-2021Describe the theory associated with the radius of an atom as it (a) gains an electron (b) loses an electron
- Published: 22-Jun-2021Would you expect the first ionization enthalpies for two isotopes of the same element to be the same or different? Justify your answer
- Published: 22-Jun-2021What are the major differences between metals and non-metals?
- Published: 22-Jun-2021These are some of the difficult questions in Chapter 3 of Class XI Physics NCERT - Motion in a Plane. I was able to provide only video solutions.
- Published: 23-Jun-2021Use the periodic table to answer the following questions. (a) Identify an element with five electrons in the outer subshell. (b) Identify an element that would tend to lose two electrons. (c) Identify an element that would tend to gain two electrons. (d) Identify the group having metal, non-metal, liquid as well as gas at the room temperature.
- Published: 24-Jun-2021The increasing order of reactivity among group 1 elements is Li < Na < K < Rb < Cs whereas that among group 17 elements is F > CI > Br > I. Explain.
- Published: 24-Jun-2021Write the general outer electronic configuration of s-, p-, d- and f- block elements.
- Published: 26-Jun-2021Assign the position of the element having outer electronic configuration (i) ns2np4 for n=3 (ii) (n-1)d 2ns2 for n=4, and (iii) (n-2) f 7 (n-1)d 1ns2 for n=6, in the periodic table.
- Published: 27-Jun-2021The first (∆iH1) and the second (∆iH2) ionization enthalpies (in kJ mol-1) and the (∆egH) electron gain enthalpy (in kJ mol-1) of a few elements are given below [see book]: (a) the least reactive element. (b) the most reactive metal.(c) the most reactive non-metal. (d) the least reactive non-metal. (e) the metal which can form a stable binary halide of the formula MX2(X=halogen). the metal which can form a predominantly stable covalent halide of the formula MX (X=halogen)?
- Published: 28-Jun-2021Predict the formulas of the stable binary compounds that would be formed by the combination of the following pairs of elements. (a) Lithium and oxygen (b) Magnesium and nitrogen (c) Aluminium and iodine (d) Silicon and oxygen (e) Phosphorus and fluorine (f) Element 71 and fluorine