1. When scientists look at these examples, what do they know about the atoms? Carbon-12 Carbon-14
   
   

The number of neutrons in each atom is not the same

The atoms have different properties

One atom has more protons than the other

Onl one of the examples is an isotope

1. What is common to all elements in the same group in the periodic table? *
   

They have the same number of neutrons

They are all nonmetals

They have the same number of outer electrons

Their properties are very different