Isotopes and Mass Number

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, resulting in different mass numbers.

Front

How is the mass number of an isotope calculated?

Back

The mass number is calculated by adding the number of protons and neutrons in the nucleus of an atom.

Front

What does the atomic number represent?

Back

The atomic number represents the number of protons in the nucleus of an atom and determines the element's identity.

Front

How many neutrons are in the isotope 89Kr?

Back

53 neutrons.

Front

What is the mass number of Chlorine-35?

Back

The mass number of Chlorine-35 is 35.

Front

What is the relationship between isotopes and mass number?

Back

Isotopes of an element have the same atomic number but different mass numbers due to varying numbers of neutrons.

Front

How many electrons does Fluorine-19 have?

Back

Fluorine-19 has 9 electrons.

Front

What is the atomic number of Fluorine-19?

Back

The atomic number of Fluorine-19 is 9.

Front

What is the significance of neutrons in an atom?

Back

Neutrons contribute to the mass of an atom and help stabilize the nucleus.

Front

Can isotopes have different chemical properties?

Back

Isotopes generally have the same chemical properties because they have the same number of electrons, but their physical properties may differ.