Atomic Theory and Subatomic particles

Who is credited with beginning the search for a description of matter more than 2400 years ago?

• Plato

• Aristotle

• Democritus

• Dalton

Which model of the atom proposed that atoms were made from a positively charged substance with negatively charged electrons scattered about?

• Democritus' model

• Dalton's model

• Thomson's plum pudding model

• Rutherford's gold foil experiment

What did Rutherford's gold foil experiment reveal about the structure of an atom?

• Atoms are made of a positively charged substance with negatively charged electrons scattered about.

• The location of electrons depends on their energy.

• Atoms have a small, dense, positively charged center called the nucleus.

• Electrons move in definite orbits around the nucleus.

Which model of the atom proposed that electrons move in definite orbits around the nucleus?

• Bohr model

• Dalton's model

• Thomson's plum pudding model

• Democritus' model

what are isotopes?

• Isotopes are elements that have the same number of neutrons but different numbers of protons.
• Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.
• Isotopes are different forms of the same element that have different numbers of protons.
• Isotopes are elements that have the same number of electrons but different numbers of protons.

Who proposed the concept of electron shells in the atomic model?

• Bohr

• Dalton

• Rutherford

• Thomson

What is the significance of isotopes in the study of atoms?

• They help in understanding the distribution of electrons in different energy levels.

• They provide information about the number of protons in an atom.

• They reveal the variations in the number of neutrons in atoms of the same element, aiding in the study of atomic structure.

• They indicate the charge of the atom.

Which atomic model first introduced the concept of a central nucleus?

• Bohr's model

• Rutherford's model

• Dalton's model

• Thomson's model

What is the main difference between Bohr's model and Rutherford's model of the atom?

• Bohr's model proposed a central nucleus, while Rutherford's model did not.

• Rutherford's model proposed that electrons move in definite orbits, while Bohr's model did not.

• Bohr's model proposed that electrons move in definite orbits, while Rutherford's model did not.

• Rutherford's model proposed a central nucleus, while Bohr's model did not.

What did Dalton's atomic theory propose about atoms?

• Atoms are indivisible and indestructible.

• Atoms have a small, dense, positively charged center called the nucleus.

• Atoms are made of a positively charged substance with negatively charged electrons scattered about.

• The location of electrons depends on their energy.