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what is diagonal relationship?explain its causes.
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+
pls.explain why fluorine has less negative electron gain enthalpy than chlorine.
which of the following represents most electropositive element
what is penultimate shell
what is polarising power?
Why do we need to classify elements?
A+2is isoelectronic with 'CO2' & has ( z+2 ) neutrons.
(A) Mass no. of A+2is 50
(B) Last electron enters in 's' orbital in element A
(C) No. of Unpaired electron in A is 4
(D) During formation of A+2, electrons are removed from both s & d subshell.
HOW WOULD YOU JUSTIFY THE PRESENCE OF 18 ELEMENTS IN THE FIFTH PERIOD OF THE PERIODIC TABLE?
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--
explain the electron gain enthalpy?
oxidation state and covalency of aluminium in (AlCl(H2O)5)+2 are same or differrent? justify
arrange the following in dexresing electron gain enthalpy(negative)
b, c, n, o
what is ionization enthalpy
what is the difference between valency and covalency.
Difference between Electronegativity and Electron Gain Enthalpy..??
What is meant by predominantly ionic?
Explain the diagonal relation ship between Li and Mg
Is there any trick 2 learn periodic table?
which of the following p-block elements are not representative elements?
a- alkali metal
b- group 14 elements
c-group 18 elements
please explain why chlorine is more electonegative than flourine however in p-block metallic character increses? please don't repeat the same answer.
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
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?
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 differentiating electron
WHICH HAS HIGHER LATTICE ENTHALPY AND WHY?
MgO AND NaCl
which of the following ions has largest radius?
Mg2+ ion is smaller than O2- ion although both have same electronic configuration..why??
Ca2+ is isoelectronic with
define strength of a solution?
what are the drawbacks of the long form periodic table?
Are the oxidation state and covalency of Al in [AlCl(H2O)6]2+ same??
Out of Na and Na+ which one has larger size and why?
Which is stable O22+ or O22-, And Why ?
What is meant by Unipositive and Dipositive ion?
an atom with high electronegativity generally has
a- tendency to form +ve ions
b- high ionization enthalpy
c- large atomic size
d- less -ve electron gain enthalpy
The electron gain enthalpy values of halogens become more negative in the order F>Cl>Br>I.
Comment on this statement
which is the largest element in the periodic table? why?
How to calculate screening constant for a given element ????
What is meant by penetration effect of the electrons?
elements of IB and II B are called
a- normal elements
b- transition element
c- alkaline earth metals
d- alkali metals
why o has lower ionisation enthalpy than N and F?
which of the following periodic properties has no unit?
a- ionization enthalpy
b- atomic radius
d- electron gain enthalpy
Why are f-block elements called "Inner-transition elements" ?
why does cl have more negative electron gain enthalpy than F ?
How is potassium bigger than barium in size?
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
Why group 1 elements are called alkali metals?Why Group 2 elements are called alkali earth metals?
which of the following valence electron experience maximum effective nuclear charge ?
4s1, 4p1, 3d1 , 2p3 ?? n why
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 first member of the lanthanide series is lanthanum . True / False
why group 17 elements called halogens...
Electron gain enthalpy of Oxygen and Fluorine is less negative than suceeding element S and Cl. Why?
why there are 14 elements in the lanthanoid series.
What is Covalency?How to find the covalency of any element
why is second ionization enthalpy greater than first ionization enthalpy?pls.explain
In which of the following sets elements have nearly same atomic radii and why??
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
What do we mean by Reducing nature and oxidising nature? Please explain with help of examples and in detail too. Thank you.
FULL FORM OF METAL
CH4 , H2O , NH3 order of increasing bond angle around central atom
the outer most electronic configuration of the most electronegative element is
what is dsp 2 hybridization
How does atomic radius vary in a period and in a group ? How yoy explain the variation ?
how to calculate covalency?
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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