Electromagnetic Spectrum

What did Dalton propose about atoms?

• Atoms are indivisible and indestructible.

• Atoms can be created and destroyed.

• Atoms are made up of smaller particles.

• Atoms have a variable mass.

What discovery modified Dalton’s theory that all atoms of a given element are identical?

• Discovery of isotopes

• Discovery of Hydrogen

• Discovery of America

• Discovery of electromagnetism

J.J. Thomson discovered the electron and proposed which model?

• Plum pudding model

• Bohr model

• Rutherford model

• Quantum mechanical model

Rutherford’s key finding from his gold foil experiment was:

• Atoms are mostly empty space with a small, dense nucleus.

• Electrons orbit the nucleus in fixed paths.

• Atoms are indivisible and indestructible.

• The nucleus contains protons and neutrons.

Bohr’s model explains that electrons:

• Move in fixed orbits around the nucleus

• Are scattered randomly around the nucleus

• Do not exist in specific energy levels

• Are stationary within the atom

Protons are found in the nucleus of an atom and have what charge?

• Positive charge

• Negative charge

• Neutral charge

• No charge

What is the charge of neutrons, and where are they located?

• Neutrons have a positive charge and are located in the electron cloud.

• Neutrons have no charge and are located in the nucleus.

• Neutrons have a negative charge and are located in the nucleus.

• Neutrons have no charge and are located in the electron cloud.

Electrons are located in the ______ and have a ______ charge.

• nucleus; positive

• electron cloud; negative

• proton cloud; neutral

• nucleus; negative

The atomic mass is made up of which components?

• Protons and neutrons

• Electrons and protons

• Neutrons and electrons

• Protons, neutrons, and electrons

What subatomic particles are contain in the nucleus? and how do they effect it ?

• It contains electrons and affects the atom's charge.

• It contains protons and neutrons, affecting the atom's mass and stability.

• It contains only protons and affects the atom's chemical properties.

• It contains neutrons and affects the atom's volume.