Classification Of Elements And Periodicity In Properties Flashcards
The most electropositive element in periodic table is
Caesium
Caesium is widely used in photoelectric cells due to
High electropositivity
The most dense element in the periodic table
Iridium
Best conductor of electricity is
Silver
The maximum number of isotopes are shown by the element
Tin ( sn ).
Which element has the highest ionisation enthalpy
Helium
Which element is the lightest element in the periodic table
Hydrogen
Which element has the highest melting point among metals
Tungsten
The highest melting point among the elements in the periodic table is
Diamond
Which all have positive electron gain enthalpy
Nitrogen, beryllium and noble gases
Among lanthanides which is radioactive
Promethium ( Z=61 )
Atomic number of inert gas in the 7 th period is
118
Acidic character increases as go from left to right in a
Period
The similarity between a pair of elements in different groups and different periods and located diagonally in the periodic table is known as
Diagonal relationship
Amphoteric elements are also known as
Neutral elements
The group of elements in which the last electron is present in the anti penultimate shell of atom
F block elements
The effective nuclear charge across the period
Increases
Example of diagonal relationship
Li—> Mg
Be—>Al
B—>Si
When we move down the group
The atomic and ionic radius increases
Metallic character __________ and non metallic character __________ down the group
Increase and decreases respectively
Equation of formal charge is
= total no of valence electrons - no of lone pairs- no of shared pairs
Examples of super octet molecules
PCl ,SF ,IF
5 6 7
Life saving drug used in cancer
Cisplatin and taxol
Ionic bonds exists between
Metals and non metals