The symbol of the element with atomic number 120 is
Une
Ubn
Unp
When a neutral atom is converted into cation, there is
decrease in atomic number
increase in atomic number
decrease in size
increase in size.
Elements whose atoms have the general electronic configuration 4f1-14 5s2 5p65d1 6s2 are referred to as
Transition elements
Lanthanoids
Actinoids
Representative elements
Al3+ has lower ionic radius than Mg2+ because
Al3+ has higher nuclear charge than Mg2+
Mg has less number of neutrons than Al
Al has lower ionization potential the Mg atom.
Their electro negativities are different.
The attempt for classifying elements by plotting the atomic weights of elements against the volume was made by
Newland
Doebereinier
Mendeleev
Lother Meyer
EKa- aluminium and EKa- Silicon are known as
Gallium and Germanium
Iron and Sulphur
Aluminium and Silicon
Fluorine and chlorine
On the basis of group valencies the formula of the compound formed between tin and fluorine is
SnF3
SnF4
SnF6
SnF
Out of the following ________ is not isoelectronic.
Mg2+
Cl-
Na+
O2-
The elements which form anions most readily are
Alkali metals
Halogens
Oxygen family
Nitrogen group
The number of periods in the long form of the periodic table is
Nine
Eighteen
Seven
As many as groups