The eighth element is a kind of repetition of the first, like the eighth note of an octave in music. This law is proposed by
Newlands
Mandeleef
Doberciner
Nails Bohr
The minimum energy required to remove an electron from the outermost orbital of an atom is
Atomic volume
Ionization energy
Electronegativity
Electron affinity
Among the following which is an inert gas
O2
F2
Cl2
He
Which element has the smallest size.
P
B
N
Al
Lanthanoids are
Representative elements
Inert gases
Halogens
Inner- transition elements
d- block elements are also called
Alkali metals
Representative metals
Transition elements
The basis of modern periodic table is
Atomic number
Atomic size
Atomic mass
The unit of ionisation energy is
Debye
Angstrom
Electronvolt
Mole
Elements having incompletely filled outermost shell is known as
Inner transition elements
Noble gases
The element with the lowest first ionization energy is
Lithium
Boron
Carbon
Beryllium
