Foundations Atom Review

Front

What are isotopes?

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 electron dot diagram for a chloride ion (Cl-) and how many dots does it have?

Back

The electron dot diagram for a chloride ion (Cl-) has 8 dots and is represented with brackets and a 1- charge.

Front

Which subatomic particles have a mass of approximately 1 atomic mass unit (u)?

Back

Protons and neutrons each have a mass of approximately 1 u.

Front

How can you identify nuclei of the same element?

Back

Nuclei of the same element have the same number of protons, but may have different numbers of neutrons.

Front

What does an excited state of an atom mean?

Back

An excited state of an atom occurs when one or more electrons have absorbed energy and moved to a higher energy level.

Front

What is the electron configuration for a neutral chlorine atom?

Back

The electron configuration for a neutral chlorine atom is 2-8-7.

Front

What is the charge of a chloride ion (Cl-)?

Back

The charge of a chloride ion (Cl-) is 1-.

Front

What is the difference between protons, neutrons, and electrons?

Back

Protons are positively charged, neutrons are neutral, and electrons are negatively charged subatomic particles.

Front

How do you determine the number of neutrons in an isotope?

Back

To determine the number of neutrons in an isotope, subtract the atomic number (number of protons) from the mass number.

Front

What is the mass number of an atom?

Back

The mass number of an atom is the total number of protons and neutrons in its nucleus.