Final Review Unit 3 & 4

Front

What is the mass number of an atom?

Back

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

Front

How do you calculate the mass number of an atom with 10 protons and 15 neutrons?

Back

Mass number = Protons + Neutrons = 10 + 15 = 25.

Front

What is a cation?

Back

A cation is a positively charged ion, formed when an atom loses one or more electrons.

Front

What is the charge of an ion with 11 protons and 10 electrons?

Back

The charge is +1, because there is one more proton than electrons.

Front

What does the atomic number represent in an element's symbol?

Back

The atomic number represents the number of protons in the nucleus of an atom.

Front

In the symbol 16N, what does the 16 represent?

Back

The 16 represents the mass number, which is the total number of protons and neutrons.

Front

What is an anion?

Back

An anion is a negatively charged ion, formed when an atom gains one or more electrons.

Front

What is the difference between an isotope and a regular atom?

Back

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.

Front

How do you determine the charge of an ion?

Back

The charge of an ion is determined by the difference between the number of protons and electrons.

Front

What is the significance of the number of neutrons in an atom?

Back

The number of neutrons affects the mass of the atom and can result in different isotopes.