The Periodic Table of Elements

Front

Atomic number indicates:

Back

Number of protons in the nucleus.

Front

Valence electrons in Alkaline Earth metals

Back

2

Front

Alkali metal

Back

Sodium

Front

Mendeleev's periodic table gaps

Back

Undiscovered elements with predicted properties

Front

Three main groups of elements: metals, nonmetals, and...

Back

metalloids (semiconductors)

Front

Most elements on the periodic table are

Back

metals

Front

Elements in the same group have similar

Back

chemical properties

Front

Order of elements in periodic table

Back

Based on atomic number

Front

Alkali metals location

Back

Left-most column of the periodic table

Front

Properties of non-metals

Back

Often gases at room temperature