How are elements organized in the periodic table ?

• Alphabetically

• Based on physical and chemical properties

• Increasing number of electrons

• Most reactive to least reactive

Most elements on the periodic table are classified as ____________.

• Gases

• Metalloids

• Metals

• Nonmetals

Groups on the periodic table are arranged...

• Vertically

• Horizontally

• Diagonally from bottom right corner

• Diagonally from top right corner

Which accurately describes nonmetals?

• Poor conductors of electricity

• Often used in computer parts

• Both malleable and ductile

• Both dull and brittle

Which group on the periodic table is the most reactive?

• Group 1

• Group 2

• Group 13

• Group 18

What is the chemical symbol for Sodium?

• S

• So

• Na

• Ca

A neutral atom of _____________ has 52 electrons.

• Chromium

• Tellurium

• Manganese

• Antimony

Each horizontal row on the periodic table is called a what?

• Group

• Row

• Period

• Family

Who arranged the periodic table of elements by the atomic mass (or mass number)?

• Democritus

• John Dalton

• Henry Moseley

• Dmitri Mendeleev

Identify the unknown atom.

• Flourine

• Beryllium

• Boron

• Helium