Answer the following questions.
Round up the following up to three significant figures (a) 34.216
Define Mole.
8. Calculate the molar mass of CH..
1. Write the general electronic configuration of d-block elements.
. Cation with the larger positive charge will have smaller radius why
. Name the most electronegative elements in period table.
State modern periodic law
5. How many periods and groups are presents in the long form of the
. State law of octave.
State law of traids.
nswer the following questions.
What are isolelectronic species? Give example
Electron gain enthalpy of fluorine is less egative than that of chl
Answers
Answer:
Explanation:
(i) The number 34.216 is rounded to three significant figures as 34.2.
Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.
In general the electronic configuration of these elements is (n-1)d1–10 ns1–2. ns orbital may have one or two electrons.The (n–1) stands for the inner d orbitals which may have one to ten electrons and the outermost.
the cation with greater positive charge will have smaller radius while anion with greater negative charge have larger radius. ... since cation has donated electrons,it has greater nuclear charge and hence it has gained ability to attract the electrons revolving around it
O is the most electronegative element among these because electronegativity increases as we move from left to right in a period of the periodic table.
Modern periodic law: The Modern periodic law states “The chemical and physical properties of elements are a periodic function of their atomic numbers”.
The long form of modern periodic table consists of seven rows called periods and eighteen columns called groups.\
The law of octaves states that every eighth element has similar properties when the elements are arranged in the increasing order of their atomic masses
Dobereiner law of triads states that the average of the atomic masses of the first and third element in a triad will be roughly equal to the atomic mass of the second element in that triad. .
Isoelectronic species are elements or ions that have the equal number of electrons. Example: O2−,F−,Mg2+ have 10 electrons.
The negative electron gain enthalpy of fluorine is less than that of chlorine. It is due to small size of fluorine atom. As a result, there are strong interelectronic repulsions in the relatively small 2p orbitals of fluorine and thus, the incoming electron does not experience much attraction.