P.S. Exam review ch2-4

Front

What does it mean when an atom is electrically neutral?

Back

An atom is electrically neutral when the number of protons is equal to the number of electrons.

Front

What are the components of the nucleus of an atom?

Back

The nucleus of an atom contains protons and neutrons.

Front

How many atoms of oxygen are in 3Fe2O3?

Back

There are 9 atoms of oxygen in 3Fe2O3.

Front

What are valence electrons?

Back

Valence electrons are electrons found in the outermost shell of an atom.

Front

What did Thomson's atomic theory model look like?

Back

Thomson's atomic model is often described as a chocolate chip cookie, with electrons scattered within a mass of positive charge.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is an atom?

Back

An atom is the basic unit of matter, consisting of a nucleus surrounded by electrons.

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 mass number of an atom?

Back

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