The number of elements in the fourth period of the periodic table are
8
14
32
36
Which element has largest atomic radius?
H
Na
K
Rb
Lanthanoids are
Representative elements
Inert gases
Halogens
Inner- transition elements
The law of triads was introduced by
Newlands
Dobereiner
Mosely
Mendeleef
The element with the lowest first ionization energy is
Lithium
Boron
Carbon
Beryllium
The number of periods in the long form of periodic table is
Six
Seven
Eight
Eleven
Addition of oxygen is called
Reduction
Oxidation
Redox reaction
Chemical reaction
Atomic radius is expressed in units
Metre
Angstrom
Debye
Nanometre
Elements having incompletely filled outermost shell is known as
Transition elements
Inner transition elements
Noble gases
The first period has only _________ elements.
6
2
1
3
