Periodic Table

Front

What is the mass number of an element?

Back

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

Front

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

Back

To calculate the number of neutrons, subtract the atomic number (number of protons) from the mass number.

Front

What is the atomic number of an element?

Back

The atomic number is a unique number for each element that equals the number of protons in an atom of that element.

Front

What is a period in the context of the Periodic Table?

Back

A period is a horizontal row in the Periodic Table of Elements.

Front

What is an isotope?

Back

An isotope is one of several forms of a single element that contains the same number of protons but different numbers of neutrons.

Front

What is the significance of the atomic number in the Periodic Table?

Back

The atomic number determines the position of an element in the Periodic Table and its chemical properties.

Front

How many protons does an atom of Barium (Ba) have?

Back

An atom of Barium (Ba) has 56 protons.

Front

What is the relationship between mass number and atomic number?

Back

The mass number is the sum of protons and neutrons, while the atomic number is the number of protons.

Front

What does the term 'element' refer to in chemistry?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the role of neutrons in an atom?

Back

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