Chapter 4 (history, periodic table, isotopes, ions)

Front

Which particles are located in the nucleus?

Back

Protons and Neutrons.

Front

Who discovered the nucleus using the gold foil experiment?

Back

Ernest Rutherford.

Front

What is the definition of a nonmetal?

Back

A nonmetal is an element that is typically brittle, not shiny, and a poor conductor of heat and electricity.

Front

What is an isotope?

Back

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons.

Front

What is the atomic number of an element?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the atomic mass of an element?

Back

The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

Front

What is an example of an isotope?

Back

C-14 is an example of an isotope of Carbon.

Front

What is the significance of the gold foil experiment?

Back

The gold foil experiment demonstrated that atoms have a small, dense nucleus that contains most of the atom's mass.

Front

What are the main differences between metals and nonmetals?

Back

Metals are typically shiny, malleable, ductile, and good conductors of heat and electricity, while nonmetals are brittle, dull, and poor conductors.

Front

What is the charge of a proton?

Back

A proton has a positive charge.