Ch.8 The Periodic Table

Tow of the same atoms bonded together is called a(n)

• isotope

• binary atom

• diatomic molecule

• semiconductor

The average mass of all the isotopes of an element is called the

• atomic mass

• atomic number

• atomic isotope

• chemical symbol

The highly reactive nonmetals in group 17 are called

• metalloids

• actinides

• noble gases

• halogens

The central core of an atom that contains the protons and neutrons

• electron

• proton

• isotope

• nucleus

The # of protons in the nucleus of an atom

• atomic number

• atomic mass

• atomic isotope

• atomic symbol

Mendeleev arranged his periodic table in order of increasing atomic number

• true

• false

Moving across the periodic table from left to right is most reactive to less reactive

• true

• false

Moving across the periodic table from left to right in order: metals, gases, non metals

• true

• false

another name for period is family

• true

• false

On the periodic table, elements in the same column have similar properties

• true

• false