Atomic Theory and Electron Behavior

The video explores the history of atomic theory, starting with Democritus' idea of indivisible particles. Dalton's experiments in 1803 confirmed the existence of fundamental particles. Thomson's 1897 discovery introduced electrons and the Plum Pudding model. Rutherford later identified the nucleus, and Bohr established rules for electron orbitals. Modern quantum mechanics, involving contributions from Einstein and others, has further expanded our understanding of atomic structure, revealing complex behaviors of particles and waves.

What was Democritus' main idea about matter?

• Matter is an illusion and does not exist.

• Matter is composed of four elements: earth, water, air, and fire.

• Matter is made of indivisible particles called atoms.

• Matter is continuous and cannot be divided.

What did Dalton's experiments in 1803 demonstrate?

• Atoms are composed of energy waves.

• Atoms are made of protons, neutrons, and electrons.

• Atoms are fundamental particles that cannot be broken down further.

• Atoms can be divided into smaller particles.

What did Thomson discover about the atom in 1897?

• Atoms are made of energy.

• Atoms contain negatively charged electrons.

• Atoms have a dense nucleus.

• Atoms are indivisible.

What is the Plum Pudding model?

• A model where electrons are embedded in a positively charged 'pudding'.

• A model where atoms are made of four elements.

• A model where electrons orbit a dense nucleus.

• A model where atoms are indivisible.

What did Rutherford discover about the atom?

• Atoms are made of energy waves.

• Atoms are composed of four elements.

• Atoms have a dense nucleus with electrons orbiting around it.

• Atoms are indivisible.

What was Bohr's contribution to atomic theory?

• He discovered the electron.

• He proposed that electrons orbit the nucleus in fixed paths.

• He discovered the neutron.

• He suggested that atoms are indivisible.

What is the significance of the nucleus in an atom?

• It is where electrons are located.

• It is made of energy waves.

• It contains most of the atom's mass.

• It is composed of four elements.

What is a key feature of modern atomic theory?

• Atoms are composed of energy.

• Atoms are indivisible.

• Electrons have characteristics of both particles and waves.

• Atoms are made of four elements.

What does quantum mechanics suggest about electrons?

• Electrons have a dual nature as both particles and waves.

• Electrons are made of four elements.

• Electrons can only exist in one place at a time.

• Electrons are fixed in place.

What is the current understanding of the electron's nature?

• Electrons are made of four elements.

• Electrons exhibit both particle and wave characteristics.

• Electrons are purely waves.

• Electrons are fixed particles.