Atomic Structure

Front

What is the atomic number of an atom?

Back

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

Front

How is the mass number of an atom defined?

Back

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

Front

What is the relationship between atomic number and the number of protons?

Back

The atomic number is equal to the number of protons in an atom.

Front

If an atom has an atomic number of 15, how many protons does it have?

Back

It has 15 protons.

Front

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

Back

Subtract the atomic number (number of protons) from the mass number.

Front

What is the mass number of an atom with 7 protons and 7 neutrons?

Back

The mass number is 14 (7 protons + 7 neutrons).

Front

What does a higher atomic number indicate about an element?

Back

A higher atomic number indicates that the element has more protons and is therefore a different element.

Front

Can the atomic number of an element change?

Back

No, the atomic number of an element is fixed and defines the element.

Front

What is the significance of neutrons in an atom?

Back

Neutrons contribute to the mass of the atom and can affect the stability of the nucleus.

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.