Front

How did Mendeleev arrange the elements?

Back

Mendeleev arranged the elements by atomic mass.

Front

How many valence electrons does phosphorus have?

Back

Phosphorus has 5 valence electrons.

Front

What are valence electrons?

Back

Valence electrons are the electrons farthest away from the nucleus.

Front

What is a vertical column in the periodic table called?

Back

A vertical column is called a group.

Front

What are cations?

Back

Cations are positively charged ions.

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 significance of the periodic table?

Back

The periodic table organizes elements based on their atomic number and properties.

Front

What are anions?

Back

Anions are negatively charged ions.

Front

What does the term 'period' refer to in the periodic table?

Back

A period refers to a horizontal row in the periodic table.

Front

What is the relationship between group number and valence electrons?

Back

Elements in the same group have the same number of valence electrons.