Contributions of Scientists to Chemistry

The video explores the history of the discovery of elements, focusing on key figures like JJ Thompson and Henry Mosley. Thompson's work led to the discovery of the electron, while Mosley's research on X-ray spectra revolutionized the understanding of atomic numbers. The narrative also covers the development of the atomic bomb and the creation of new elements, highlighting the contributions of scientists like Glenn Seaborg. The video emphasizes the ongoing quest to understand matter and the periodic table's evolution.

What did JJ Thompson discover about the nature of electricity?

• It is a type of chemical reaction.

• It is composed of negatively charged particles called electrons.

• It is composed of positively charged particles.

• It is a form of light.

What was Henry Mosley's significant contribution to the periodic table?

• He discovered radioactivity.

• He arranged elements by atomic weight.

• He discovered the neutron.

• He used X-rays to determine atomic numbers.

How did Mosley's work change the understanding of the periodic table?

• It demonstrated that elements are made of protons and neutrons.

• It proved that all elements are radioactive.

• It revealed that atomic number is fundamental to element properties.

• It showed that atomic weight is the most important factor.

What was the impact of Mosley's death on the scientific community?

• It led to the discovery of new elements.

• It was a significant loss as he was a leading physicist.

• It had little impact as his work was not well-known.

• It resulted in the end of World War I.

What discovery in 1939 changed the course of nuclear research?

• The discovery of the electron.

• The discovery of the proton.

• The splitting of the uranium atom.

• The invention of the cyclotron.

What was Glenn Seaborg's role in the development of the atomic bomb?

• He discovered uranium.

• He developed the cyclotron.

• He discovered plutonium, a key element for the bomb.

• He led the Manhattan Project.

What was the significance of the first test of an atomic bomb?

• It marked the beginning of the nuclear age.

• It ended World War II.

• It was the first use of uranium in warfare.

• It was a failure and led to further research.

What was one of the post-war achievements of Glenn Seaborg?

• He invented the cyclotron.

• He discovered the electron.

• He created new elements beyond plutonium.

• He developed the first nuclear reactor.

How many new elements have been added to the periodic table since Seaborg's time?

• 15

• 10

• 30

• 25

What are the basic building blocks of matter according to modern science?

• Air, water, earth, and fire

• Protons, neutrons, and electrons

• Atoms and molecules

• Light and energy