Chem 10 Grade chapter 4

The smallest particle of an element that retains its identity in a chemical reaction

• Atom

• Cells

• Molecule

The first theory to relate chemical changes to events at the atomic level

• Dalton's atomic theory

• Bohr's Theory

• Rutherford's Hypothesis

Are the three subatomic particles of an atom:

• electron

• protons

• neutrons

• compounds

His approach about the atomic structure was not based on the scientific method.

• Democritus

• Dalton

• JJ Thomson

Is part of Dalton's hypotheses and theories to explain his observations of the atomic theory

• All elements are composed of tiny indivisible particles called atoms.

• Atoms of the same element are not identical

• Atoms of one element, however, always change into atoms of another element as a result of a chemical reaction

Scientists use many methods to “see” inside an atom.

• True

• False

A negatively charged subatomic particle

• electron

• neutron

• proton

A positively charged subatomic particle found in the nucleus of an atom

• proton

• neutron

• electron

A subatomic particle with no charge.

• neutron

• proton

• electron

The tiny, dense central portion of an atom, composed of protons and neutrons

• nucleus

• electron

• electron cloud