Which of the following is a mixture?

(circles of different colors represent different types of atoms)

(circles that are touching are chemically bonded)

Who is the Father of the Periodic Table ?

How many neutrons in Francium?

What is the atomic mass of Potassium?

What is the atomic number of Francium?

Atoms are mostly made up of...

Which element will have the most similar physical and chemical properties to the element Sulfur (S)? 

How do you calculate the number of neutrons? *

Based on the location of sodium in the periodic table how many energy levels does it contain?

Some elements on the periodic table use their ancient Latin or Greek abbreviation for their symbols. Which answer uses its Latin name for its symbols?

These elements are shiny solids that are malleable and ductile. They are good conductors of heat and electricity.

These elements have propeties of metals and nonmetals. Some have a metallic luster but is also brittle. Some are semi-conductors

These elements are poor conductors of heat and electricity. They are typically dull and brittle.