Question : Lanthanides are often called:

Option 1: Alkali metals

Option 2: Rare earth elements

Option 3: Inert gases

Option 4: D-block elements

Question : Isobars have ______.

Option 1: Same mass number but different atomic numbers

Option 2: Different mass numbers but same atomic numbers

Option 3: Same mass and atomic numbers

Option 4: Different mass and atomic numbers

Question : Heavy metals got their name because compared to other atoms they have

Option 1: Higher densities

Option 2: higher atomic masses

Option 3: Higher atomic numbers

Option 4: Higher atomic radii

Question : The Security Council of UN consists of

Option 1: 5 permanent and 10 non-permanent members

Option 2: 10 permanent and 5 non-permanent members

Option 3: 15 permanent members

Option 4: 15 non-permanent members

Question : The difference between two numbers is 9 and the difference between their squares is 207. The numbers are:

Option 1: 17 and 8

Option 2: 16 and 7

Option 3: 15 and 6

Option 4: 15 and 7