This scientist noticed a pattern of properties when he arranged the elements in order of increasing atomic mass.

• Albert Einstein

• Dmitri Mendeleev

• Theodor Schwann

• Ernest Rutherford

At the very center of every atom is a _____ which contains particles.

• Proton

• Membrane

• Nucleus

• Electron cloud

This small particle in the nucleus carries a positive charge.

• Electron

• Neutron

• Proton

The atomic number of an element tells you how many _____ and _____ are found in the nucleus of one atom of that element.

• Protons and Neutrons

• Electrons and Protons

• Neutrons and Electrons

• Protons, Neutrons, and Electrons

This negatively charged particle is found outside the nucleus in what is termed the "electron cloud".

• Protons

• Neutrons

• Electrons

Which is the correct chemical symbol for the element Argon?

• A

• ARG

• Ar

• AR

The periodic table shown has 7 colored rows. These are called:

• Periods

• Groups

• Columns

• Atomic clusters

This image shows that the periodic table has 18 vertical columns called:

• Rows

• Periods

• Vertical clusters

• Groups

Which group of the periodic table is named the "Noble Gases"?

• Group 1

• Group 18

• Groups 14-18

• Group 13

These particular type of elements found on the periodic table (such as Aluminum and Copper) are good conductors of electricity and heat.

• Noble Gases

• Non-metals

• Metals

• Lanthanides