CU8: Atomic Parts and Pieces

Front

What is the atomic number of an element?

Back

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

Front

How many protons does an atom of Sodium (Na) have?

Back

An atom of Sodium (Na) has 11 protons.

Front

What charge do electrons have?

Back

Electrons have a negative charge.

Front

What particles are found in the nucleus of an atom?

Back

The nucleus of an atom contains protons and neutrons.

Front

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

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the mass number of an atom?

Back

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

Front

What is the charge of protons?

Back

Protons have a positive charge.

Front

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

Back

In a neutral atom, the number of electrons equals the atomic 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 ion?

Back

An ion is an atom that has gained or lost one or more electrons, resulting in a net charge.