Periodic Table

Front

The first energy shell can hold ______ electrons.

Back

2

Front

Mendeleev's genius was his ability to __________.

Back

predict elements that were not discovered yet

Front

Rows on the periodic table are called ___________.

Back

Periods

Front

Valence means......

Back

outside

Front

The symbol for Iodine is __________.

Back

I

Front

What is the periodic table?

Back

A chart that organizes all known elements by their properties.

Front

What do we call the vertical columns in the periodic table?

Back

Groups or Families

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances.

Front

What is the atomic number?

Back

The number of protons in the nucleus of an atom.

Front

What is the significance of the periodic table?

Back

It helps predict the properties of elements and their relationships.