Modern Chemistry Concepts and Predictions

How many new elements were recently named, making the periodic table appear full?

• 2

• 4

• 6

• 8

What was the maximum atomic weight Elliot Quincy Adams predicted an element could have in 1911?

• 100

• 118

• 256

• 137

How are elements primarily counted or organized in modern chemistry?

• By their atomic weight

• By their atomic number

• By their number of neutrons

• By their electron configuration

What does atomic weight represent?

• The number of protons

• The number of neutrons

• The number of protons plus the number of neutrons

• The number of electrons

According to Richard Feynman's initial calculations, an atom with how many protons would violate special relativity?

• 99

• 118

• 137

• 173

Why did Richard Feynman predict a limit to the number of protons an atom could have?

• Electrons would become too heavy

• The nucleus would become too unstable

• Electrons would need to move faster than the speed of light

• The atom would collapse due to excessive positive charge

When Feynman's calculation is adjusted to account for the size of the nucleus, what is the revised maximum atomic number predicted?

• 118

• 137

• 173

• 256

What are 'islands of stability' in the context of superheavy elements?

• Elements that are extremely unstable and decay instantly

• Elements that are more stable than expected due to their nuclear structure

• Elements found only in specific stable geological formations

• Elements that can only be created in space