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what is diagonal relationship?explain its causes.
what is polarising power?
pls.explain why fluorine has less negative electron gain enthalpy than chlorine.
which of the following represents most electropositive element
what is penultimate shell
Why do we need to classify elements?
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?
Ca2+ is isoelectronic with
oxidation state and covalency of aluminium in (AlCl(H2O)5)+2 are same or differrent? justify
The first member of the lanthanide series is lanthanum . True / False
what is ionization enthalpy
what are the drawbacks of the long form periodic table?
what is the difference between valency and covalency.
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.
Difference between Electronegativity and Electron Gain Enthalpy..??
Explain the diagonal relation ship between Li and Mg
What do we mean by Reducing nature and oxidising nature? Please explain with help of examples and in detail too. Thank you.
Is there any trick 2 learn periodic table?
why there are 14 elements in the lanthanoid series.
please explain why chlorine is more electonegative than flourine however in p-block metallic character increses? please don't repeat the same answer.
which is the largest element in the periodic table? 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 ion is smallest in size
what is differentiating electron
WHICH HAS HIGHER LATTICE ENTHALPY AND WHY?
MgO AND NaCl
Is Na2 is possible.
Mg2+ ion is smaller than O2- ion although both have same electronic configuration..why??
define strength of a solution?
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 of the following ions has largest radius?
Which is stable O22+ or O22-, And Why ?
What is meant by Unipositive and Dipositive ion?
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.
The electron gain enthalpy values of halogens become more negative in the order F>Cl>Br>I.
Comment on this statement
elements of IB and II B are called
a- normal elements
b- transition element
c- alkaline earth metals
d- alkali metals
How to calculate screening constant for a given element ????
What is meant by penetration effect of the electrons?
why o has lower ionisation enthalpy than N and F?
Why are f-block elements called "Inner-transition elements" ?
why does cl have more negative electron gain enthalpy than F ?
comment on the statement
"all elements having high ionization energies also have high electron affinities".
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?
What is meant by predominantly ionic?
nitroge has positive electron gain enthalpy whereas oxygen has negative,however oxygen has lower ionization enthalpy than nitrogen.explain.
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
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...
which of the following is isoelectronic with carbonatom
Electron gain enthalpy of Oxygen and Fluorine is less negative than suceeding element S and Cl. Why?
the outer most electronic configuration of the most electronegative element is
which of the following is arrange in the order of decreasing electropositive character
a-Fe, Mg, Cu
What is Covalency?How to find the covalency of any element
why is second ionization enthalpy greater than first ionization enthalpy?pls.explain
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
In which of the following sets elements have nearly same atomic radii and why??
CH4 , H2O , NH3 order of increasing bond angle around central atom
what is dsp 2 hybridization
How does atomic radius vary in a period and in a group ? How yoy explain the variation ?
account the following:
a)ionization enthalpy of nitrogen is greater than that of oxygen
b)atomic radius decreses from left to right in a period
c)electron gain enthalpy of fluorine is less negative than that of chlorine
how to calculate covalency?
how we can learn periodic table fast n easily ????????plz give me ur suggstions frzzzzz
explain why the s-block elements are very reactive.
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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