Periodic Table of Elements

What do the numbers represent?

• upper left = the atmoic number/ number of protons and electrons
• upper right = the relative atmoic mass
• Mg - what is this? the symbol for the element

What is the difference between Na and K?

• Na has 3 levels of energy and K has 4 levels of energy
• K is used for glass and soap, Na is used for medicine and agriculture
• K is obtained from minerals, Na is obtained form table salts and other foods