8th grade Periodic table

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

What is the mass number of an element?

Back

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

Front

What are protons?

Back

Protons are positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutrons are neutral particles found in the nucleus of an atom.

Front

What are electrons?

Back

Electrons are negatively charged particles that orbit the nucleus of an atom.

Front

How are elements arranged in the modern periodic table?

Back

Elements are arranged by increasing atomic number.

Front

What is a group in the periodic table?

Back

A group is a column in the periodic table that contains elements with similar properties.

Front

What is a period in the periodic table?

Back

A period is a row in the periodic table that indicates the number of electron shells in the elements.

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that determine its chemical properties.

Front

What is the significance of Group 15 in the periodic table?

Back

Group 15 elements have 5 valence electrons and include nitrogen (N), phosphorus (P), and arsenic (As).