Early Atomic Theories

What is the mass number of an atom?

• The total number of protons and neutrons in the nucleus.

• The total number of electrons in an atom.

• The number of protons only in the nucleus.

• The number of neutrons only in the nucleus.

What did Niels Bohr propose about electron arrangement?

• Electrons are found in specific orbits around the nucleus.

• Electrons are randomly distributed throughout the atom.

• Electrons can exist anywhere in the atom without restriction.

• Electrons are located only in the nucleus of the atom.

What model of the atom is J.J. Thomson known for?

• The 'Plum Pudding' model.

• The 'Nuclear' model.

• The 'Planetary' model.

• The 'Quantum' model.

What is the charge of a neutron?

• Positive

• Negative

• Neutral

• Variable

What is the charge of an electron?

• Positive

• Neutral

• Negative

• Variable

What did John Dalton contribute to atomic theory?

• He proposed that every element consists of one type of atom.

• He discovered the neutron as a component of the atom.

• He introduced the concept of isotopes in elements.

• He stated that atoms can be created and destroyed in chemical reactions.

What is the significance of the atomic number?

• It represents the number of protons in an atom and determines the element's identity.

• It indicates the number of neutrons in an atom.

• It determines the mass of an atom.

• It represents the number of electrons in an atom.

What is the charge of a proton?

• Negative

• Neutral

• Positive

• Variable

What did Rutherford's gold foil experiment demonstrate?

• The existence of a small, dense nucleus within the atom.

• The presence of electrons orbiting the nucleus in fixed paths.

• The atom is indivisible and cannot be broken down.

• Atoms are mostly empty space with no structure.

What did J.J. Thomson discover?

• The neutron.

• The proton.

• The electron.

• The positron.