Completed 0 of 15 questions.
Okay, let's start off easy. What is the first element on the periodic table?
What do the numbers of elements tell you about the elements?
What is magnesium's atomic number?
How many elements are on the periodic table?
All elements with an atomic number of ______ or higher are radioactive
There are two groups of elements called rare earth metals. The groups are called the lanthanides and the actinides. What are their atomic numbers?
A group of elements called the alkali metals have a special property. What is this special property?
What is the half life of francium?