A


Which of the following the highest hydration energy

Mg++

Li+

Na+

K+


Which the correct statement

Na+is smaller than Na atom

Clis smaller than Cl atom

Cl(Ion) and Cl (atom) are equal in size

Na+is larger than Na atom


The element of 2nd period, which has highest ionization energy from the following is

N

Be

C

O


Number of elements in the first period of the periodic table is

2

8

14

18


Correct order according to atomic size in the following is

Be > Mg

Na > K

O > N

Cl > F


The basis of modern periodic table is

Atomic number

Electron affinity

Atomic mass

Ionization Potential


Elements of Groups IIA are called

Alkaline earth metals

Alkali metals

Coinage metals

Halogens


Which of the following has highest M.P

Silicon

Aluminium

Phosphorus

Sulphur


Which of the following element has lowest ionization energy

Boron

Beryllium

Carbon

Oxygen


Which element has lowest melting point

Magnesium

Beryllium

Calcium

Barium