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what is diagonal relationship?explain its causes.
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
pls.explain why fluorine has less negative electron gain enthalpy than chlorine.
why is second ionization enthalpy greater than first ionization enthalpy?pls.explain
what is penultimate shell
what are the drawbacks of the long form periodic table?
Why do we need to classify elements?
First, second and third I.P values are 100eV, 150eV and 1500eV . Element can be:
a) Be b) B c) F d) Na
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
what is ionization enthalpy
Boron forms [BF4]- while aluminium forms [AlF6]3-. Why?
what is the difference between valency and covalency.
Difference between Electronegativity and Electron Gain Enthalpy..??
Which is stable O22+ or O22-, And Why ?
Explain the diagonal relation ship between Li and Mg
Arrange the following as stated:
(a) N2, O2, F2, Cl2 (Increasing order of bond dissociation energy)
(b) F, Cl, Br, I (Increasing order of electron gain enthalpy)
(c) F2, N2, Cl2, O2 (Increasing order of bond length)
Is there any trick 2 learn periodic table?
alkali metals do not form dipositive ions while alkaline metals form. why?
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?
Which of the following substances has the highest proton affinity :-
please explain why chlorine is more electonegative than flourine however in p-block metallic character increses? please don't repeat the same answer.
what is differentiating electron
Mg2+ ion is smaller than O2- ion although both have same electronic configuration..why??
WHICH HAS HIGHER LATTICE ENTHALPY AND WHY?
MgO AND NaCl
Are the oxidation state and covalency of Al in [AlCl(H2O)6]2+ same??
why first electron gain enthalpy is -ve ans second electron gain enthalpy is +ve explain.
define strength of a solution?
Out of Na and Na+ which one has larger size and why?
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 polarising power?
What is meant by Unipositive and Dipositive ion?
In which of the following sets elements have nearly same atomic radii and why??
What is meant by penetration effect of the electrons?
why does cl have more negative electron gain enthalpy than F ?
Find the formula of halide of a metal whose succcessive ionization energies are x , 2x , 5x , 20x , 25x kJ per mole respectively
Why group 1 elements are called alkali metals?Why Group 2 elements are called alkali earth metals?
why o has lower ionisation enthalpy than N and F?
Why are f-block elements called "Inner-transition elements" ?
why group 17 elements called halogens...
Arrange the following ions in the order of increasing size.
Be2+, Cl- ,S2- ,Na+, Mg2+,Br-
Also please explain why?
how to calculate covalency?
Electron gain enthalpy of Oxygen and Fluorine is less negative than suceeding element S and Cl. Why?
nitroge has positive electron gain enthalpy whereas oxygen has negative,however oxygen has lower ionization enthalpy than nitrogen.explain.
What is Covalency?How to find the covalency of any element
neon has got more atomic radius than flourine.How?
Explain why halogens have maximum electron gain enthalpy in their respective periods.
the electronic configuration of an element is 1s2 2s2 2p6 3s2 3p3.the atomic number of the element which is just below the above element in the periodic table is ________
what are typical elements and how do they differ from transision elements
CH4 , H2O , NH3 order of increasing bond angle around central atom
FULL FORM OF METAL
what is dsp 2 hybridization
How does atomic radius vary in a period and in a group ? How yoy explain the variation ?
mercury is the only metal which is liquid at 00C this is due to its
a- very high ionization enthalpy weak metallic
b- low ionization enthalpy
c- high atomic weight
d- high vapour pressure
the screening effect of inner electrons of the nucleus causes
a- decreases in the ionization enthalpy
b- increase in ionization enthalpy
c-no effect on the ionization enthalpy
d- increases the attraction of the nucleus for the electrons
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..??????
arrange the following in dexresing electron gain enthalpy(negative)
b, c, n, o
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