Struktur Atom

What did Democritus propose about the nature of matter?

• Matter is composed of continuously divisible particles.

• Matter is made of tiny, indivisible particles called atoms.

• Atoms are composed of smaller subatomic particles.

• Atoms are positively charged spheres with embedded electrons.

Which statement accurately describes a postulate of John Dalton's atomic theory?

• Atoms of different elements have identical masses and properties.

• Atoms are the smallest particles and cannot be divided further.

• Chemical reactions involve the creation or destruction of atoms.

• Compounds are formed by random combinations of atoms.

What is a key characteristic of an atom according to Rutherford's atomic theory?

• Atoms are indivisible and indestructible.

• Electrons are embedded in a positively charged sphere.

• An atom consists of a positively charged nucleus with electrons orbiting it.

• Electrons orbit the nucleus in specific energy levels.

What was a significant limitation of John Dalton's atomic theory?

• It could not explain the Law of Conservation of Mass.

• It failed to explain how atoms combine to form compounds.

• It could not explain the electrical properties of matter.

• It incorrectly stated that atoms of the same element are identical.

Which characteristic is associated with J.J. Thomson's atomic model?

• It proposed a dense, positively charged nucleus.

• It described atoms as indivisible solid spheres.

• It introduced the concept of electrons embedded in a positively charged sphere.

• It explained the existence of different isotopes for the same element.

What was a significant limitation of Rutherford's atomic theory?

• It failed to explain the existence of a positively charged nucleus.

• It could not account for the movement of electrons within the atom.

• It could not explain why electrons do not fall into the nucleus according to classical physics.

• It accurately predicted the line spectrum of hydrogen.

According to Niels Bohr's atomic theory, what happens when an electron moves from a lower energy level to a higher energy level?

• It emits energy.

• It absorbs energy.

• Its mass changes.

• It remains in a stationary state.

Are you enjoying the video lesson?

• Yes

• No

In the modern quantum mechanical model of the atom, what is an orbital?

• A fixed, circular path where electrons orbit the nucleus.

• The positively charged center of the atom.

• A region around the nucleus where there is the highest probability of finding an electron.

• A subatomic particle with a negative charge.