Atomic Number, Atomic Mass

Front

What is the definition of atomic number?

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 definition of atomic mass?

Back

Atomic mass is the weighted average mass of an atom's isotopes, measured in atomic mass units (amu).

Front

How do you calculate the mass number of an atom?

Back

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

Front

If an atom has 10 protons and 12 neutrons, what is its mass number?

Back

The mass number is 22 (10 protons + 12 neutrons).

Front

What is the charge of an atom with 5 protons and 3 electrons?

Back

The charge is +2 (5 protons - 3 electrons = 2 positive charge).

Front

How many neutrons are in an atom of Carbon-14?

Back

Carbon-14 has 8 neutrons (14 mass number - 6 protons = 8 neutrons).

Front

What is the significance of isotopes in chemistry?

Back

Isotopes are variants of the same element that have the same number of protons but different numbers of neutrons, affecting their mass and stability.

Front

How do you determine the total charge of an atom?

Back

The total charge is determined by subtracting the number of electrons from the number of protons.

Front

What happens to the mass number when neutrons are added to an atom?

Back

The mass number increases by the number of neutrons added.

Front

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

Back

In a neutral atom, the number of protons equals the number of electrons, resulting in no overall charge.