02b - Atomic Number and Atomic Mass

Front

What is the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom.

Front

What is the mass number?

Back

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

Front

Which particles are NOT included in the mass number?

Back

Electrons are not included in the mass number.

Front

What is the atomic number of Nickel?

Back

The atomic number of Nickel is 28.

Front

What element has 20 protons?

Back

Calcium (Ca) has 20 protons.

Front

If an atom has 10 electrons, how many protons does it have?

Back

If an atom has 10 electrons, it has 10 protons.

Front

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

Back

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

Front

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

Back

To find the number of neutrons, subtract the atomic number from the mass number.

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

What is an isotope?

Back

Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.