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what is diagonal relationship?explain its causes.
pls.explain why fluorine has less negative electron gain enthalpy than chlorine.
what is penultimate shell
the value of IP1, IP2 , IP3 and IP4 of an atom are respectively 7.5 eV, 25.6 eV , 48.6 eV, 170.6 eV. the electronic configuration of the atom will be--
Why do we need to classify elements?
HOW WOULD YOU JUSTIFY THE PRESENCE OF 18 ELEMENTS IN THE FIFTH PERIOD OF THE PERIODIC TABLE?
explain the electron gain enthalpy?
oxidation state and covalency of aluminium in (AlCl(H2O)5)+2 are same or differrent? justify
which of the following represents most electropositive element
what is ionization enthalpy
what is the difference between valency and covalency.
Difference between Electronegativity and Electron Gain Enthalpy..??
Explain the diagonal relation ship between Li and Mg
How is potassium bigger than barium in size?
Is there any trick 2 learn periodic table?
What is meant by predominantly ionic?
please explain why chlorine is more electonegative than flourine however in p-block metallic character increses? please don't repeat the same answer.
f-block elements are called inner transition elements because
a- they have properties similar to those to transition elements
b- they have been taken out of the transition elements
c- the last electron enters into the f-orbitals of the penultimate shell
d- the last electron enters into to f-orbitals of the ante-penultimate shell
What is electron gain enthalpy?How does it vary in group and period?explain.
Consider the following species :
N3-, O2-, F-, Na+, Mg2+ and Al3+
(a) What is common in them?
(b) arrange them in the increasing ionic radii?
In which of the following sets elements have nearly same atomic radii and why??
what is differentiating electron
which of the following valence electron experience maximum effective nuclear charge ?
4s1, 4p1, 3d1 , 2p3 ?? n why
WHICH HAS HIGHER LATTICE ENTHALPY AND WHY?
MgO AND NaCl
which of the following ion is smallest in size
Mg2+ ion is smaller than O2- ion although both have same electronic configuration..why??
define strength of a solution?
which is the largest element in the periodic table? why?
Are the oxidation state and covalency of Al in [AlCl(H2O)6]2+ same??
What do we mean by Reducing nature and oxidising nature? Please explain with help of examples and in detail too. Thank you.
Out of Na and Na+ which one has larger size and why?
what is polarising power?
Which is stable O22+ or O22-, And Why ?
What is meant by Unipositive and Dipositive ion?
what is a parent atom?
The electron gain enthalpy values of halogens become more negative in the order F>Cl>Br>I.
Comment on this statement
How to calculate screening constant for a given element ????
What is meant by penetration effect of the electrons?
The first member of the lanthanide series is lanthanum . True / False
why o has lower ionisation enthalpy than N and F?
True / False :
(A) No. of electrons having l = 0 in Pd is 10.
(B)The value of Zeff. for 3rd electron of Cr & Mn is same as no. of electron in 'd' subshell are same.
(C) Multiplicity of Fe is equal to Ni2+
Why are f-block elements called "Inner-transition elements" ?
the size of F- ion is larget than that of F atom, while that of Na+ ion is smaller than that of Na atom. explain.
why does cl have more negative electron gain enthalpy than F ?
Which of the following is not an oxide ore?
A) Haematite B) siderite C) Bauxite D) Pyrolusite
02. Which of the following is not an ore of aluminium?
A) Cryolite B) Feldspar C) Bauxite D) Azurite
03. Which of the following represents an oxidation only change?
A) Cu2+ (aq) + 2e---------> Cu (g) B) Mg (s) + Fe 2+ (aq) ---------> Mg2+ (aq) + Fe(s)
C)Cl2 (aq) + 2e---------> 2Cl (aq) D) Zn (s) -- 2e- ------> Zn2+ (aq)
The order of first electron affinity of O , S and Se :-
(A) O>S>Se (B) S>Se>O (C) Se>O>S (D) S>O>Se
explain why the s-block elements are very reactive.
first ionisation energy is lowest in :
carbon, lead,silicon or tin ???
Why group 1 elements are called alkali metals?Why Group 2 elements are called alkali earth metals?
group no. valency has no relation in
a- 1st group
nitroge has positive electron gain enthalpy whereas oxygen has negative,however oxygen has lower ionization enthalpy than nitrogen.explain.
Arrange the following ions in the order of increasing size.
Be2+, Cl- ,S2- ,Na+, Mg2+,Br-
Also please explain why?
the 1st ionization enthalpy of calcium is greater than that of potassium because for calcium
a- the electron is removed from s-subshell
b- the effective nuclear charge is higher
c- the electron is removed from a p-subshell
d- the removal of electron does not give noble gas configuration
why group 17 elements called halogens...
Electron gain enthalpy of Oxygen and Fluorine is less negative than suceeding element S and Cl. Why?
For p block elements:
Outermost electronic configuration varies from ns2np1 to ns2np6 in each period
but helium is also present in p block and its electronic configuration is 1s2
so doesnt the OEC vary from ns2 to ns2np6?
What is Covalency?How to find the covalency of any element
First, second and third I.P values are 100eV, 150eV and 1500eV . Element can be:
a) Be b) B c) F d) Na
why is second ionization enthalpy greater than first ionization enthalpy?pls.explain
the outer most electronic configuration of the most electronegative element is
neon has got more atomic radius than flourine.How?
Explain why halogens have maximum electron gain enthalpy in their respective periods.
what are typical elements and how do they differ from transision elements
FULL FORM OF METAL
CH4 , H2O , NH3 order of increasing bond angle around central atom
which of the following ions has largest radius?
what is dsp 2 hybridization
How does atomic radius vary in a period and in a group ? How yoy explain the variation ?
what is the cause of poor shielding effect of gallium ?
what do you mean by diffused shape of orbital?
how to calculate covalency?
what are the drawbacks of the long form periodic table?
how we can learn periodic table fast n easily ????????plz give me ur suggstions frzzzzz
the first ionisation energy of nitrogen is greater then that of oxygen , whereas the second ionisation energy of oxygen is greater than nitrogen....WHY..??????
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