The statement true about an element with atomic number 54 is
Its electro negativity is very high
It has a very low ionization enthalpy
It has a very high electron gain enthalpy
Its molecules are mono atomic.
On descending a group in the periodic table
Metallic character of elements increases
Electro negativity of elements increases
Ionization energy of elements increases
Size of elements decreases
In a given period, the alkali metals have _________
Lowest ionization energy
Smallest atomic size
Highest electron affinity
Lowest density
The incorrect statement among the following is
The ionisation potential of 'Be' is greater than that of 'B'.
The electro negativity of 'F' is greater than that of 'Cl'.
The ionisation potential of 'N' is greater than that of 'O'.
The electron affinity of 'F' is greater than that of 'Cl'.
Diagonal relationship is shown by _______
f- block elements
elements of second period
d- block elements
elements of first period
The least stable ion among the following is
B-
Li-
Be-
C-
Out of the following the atomic number of the element having highest vapour pressure at room temperature is
Z=25
Z=48
Z=30
Z=80
When a neutral atom is converted into cation, there is
Decrease in atomic number
Increase in atomic number
Decrease in size
Increase in size.
An element belongs to fourth period of p- block elements. It has 5 electrons in its outermost shell. Then, the correct statement regarding the element is
It belongs to group 15 and has 5 unpaired electrons.
It belongs to group 15 and has no unpaired electrons.
It belongs to group 14 and has 3 unpaired electrons.
It belongs to group 15 and has 3 unpaired electrons.
On the basis of group valencies the formula of the compound formed between tin and fluorine is
SnF3
SnF4
SnF6
SnF
