Observe: most atoms are stable with a configuration of eight valence electrons. this is known as the octet rule. how many valence electrons does each atom have? sodium: chlorine:

What can be found in the ionosphere

Connect the whole numbers on the periodic table to indicate what they represent?

The diagram shows the relationship between scientific disciplines. the names of some scientific disciplines have been removed from the boxes. which scientific discipline belongs in the blue box? a. physics b. biology c. chemistry d. metallurgy