d and f BLOCK ELEMENTS Quiz

• Boron and Carbon
• Lithium and Fluorine
• Nitrogen and Oxygen
• Beryllium and Boron

• It proves that all elements are identical
• It shows that atomic weight is constant
• It suggests that element properties are random
• It indicates that the underlying structure of atoms is related to atomic weight

• They independently discovered the noble gases
• They proved that atomic weight was not important
• They provided early observations and attempts that laid the groundwork for later scientists
• They established the concept of electron shells

• The existence of subatomic particles
• The speed of light
• Properties of undiscovered elements
• The structure of the atomic nucleus

• Elements should be grouped based on their valency electrons
• Elements combine to form compounds with fixed ratios
• All elements have unique spectral lines
• Arranging elements by atomic weight reveals periodic trends in properties