20-21 Structure of the Atom Review

Front

What is the mass number of an atom?

Back

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

Front

What is the atomic number of an element?

Back

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

Front

How do you calculate the number of neutrons in an atom?

Back

Number of Neutrons = Mass Number - Atomic Number.

Front

What does the symbol 'A' represent in nuclear notation?

Back

In nuclear notation, 'A' represents the mass number of the atom.

Front

What does the symbol 'Z' represent in nuclear notation?

Back

In nuclear notation, 'Z' represents the atomic number, which is the number of protons.

Front

Which group of elements has 4 valence electrons?

Back

Group 14 elements have 4 valence electrons.

Front

What is the relationship between protons and electrons in a neutral atom?

Back

In a neutral atom, the number of protons equals the number of electrons.

Front

What is an isotope?

Back

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

Front

What is the significance of valence electrons?

Back

Valence electrons determine how an element reacts chemically and its bonding behavior.

Front

What is the formula for calculating the number of protons in an atom?

Back

The number of protons is equal to the atomic number (Z).