Front

What is the atomic number of an element?

Back

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

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 many electrons can the first energy level hold?

Back

The first energy level can hold a maximum of 2 electrons.

Front

How many electrons can the second energy level hold?

Back

The second energy level can hold a maximum of 8 electrons.

Front

How many electrons can the third energy level hold?

Back

The third energy level can hold a maximum of 18 electrons.

Front

What is the chemical symbol for Krypton?

Back

The chemical symbol for Krypton is Kr.

Front

What is the significance of the periodic table in chemistry?

Back

The periodic table organizes elements based on their atomic number, electron configuration, and recurring chemical properties.

Front

What is an unknown atom in chemistry?

Back

An unknown atom refers to an element whose identity is not specified but can be determined through its properties.

Front

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

Back

The number of neutrons can be found by subtracting the atomic number from the mass number.

Front

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

Back

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