Atomic radius is expressed in units
Metre
Angstrom
Debye
Nanometre
The element with the lowest first ionization energy is
Lithium
Boron
Carbon
Beryllium
Among the following which is an inert gas
O2
F2
Cl2
He
The electronegativity of flourine is
4
3
3.5
4.5
The basis of modern periodic table is
Atomic number
Atomic size
Atomic mass
Atomic volume
Lanthanoids are
Representative elements
Inert gases
Halogens
Inner- transition elements
The unit of ionisation energy is
Electronvolt
Mole
d- block elements are also called
Alkali metals
Representative metals
Transition elements
The law of triads was introduced by
Newlands
Dobereiner
Mosely
Mendeleef
The number of periods in the long form of periodic table is
Six
Seven
Eight
Eleven