According to the modern periodic law, the properties of the elements are periodic function of their:
(A) Atomic number
(B) Number of electrons
(C) Mass number
(D) Number of valence electrons
4th and 5th period of the long form of Periodic Table are called:
(A) Short periods
(B) normal periods
(C) Long periods
(D) Very long periods
Salts of sodium give:
(A) Bluish green
(B) Red
(C) Yellow
(D) Green
Which element exists in liquid form at room temperature?
(A) Ba
(B) Br
(C) Be
(D) B
Mark the incorrect statement.
(A) 2nd period contains eight elements
(B) 3rd period contains eight elements
(C) 4th period contains 18 elements
(D) 7th period contains 23 elements only
Mendeleev Periodic Table was based upon the:
(A) Electronic configuration
(B) atomic mass
(C) Atomic number
(D) completion of a subshell
The ionization energy of sodium is:
(A) +495.8 kj/mol
(B) +594.8 kj/mol
(C) -495.8 kj/mol
(D) -594.8 kj/mol
ns2 is the general electronic configuration of:
(A) Boron family
(B) Nitrogen family
(C) Alkali metals
(D) Alkaline earth metals
The atomic radii of the elements in Periodic Table:
(A) Increase from left to right in a period
(B) Increase from top to bottom in a group
(C) Do not change from left to right in a period
(D) Decrease from top to bottom in a group
Mark the incorrect statement about ionization energy:
(A) It is measured in kJmol-1
(B) It is absorption of energy
(C) It decreases in a period
(D) It decreases ina group
