Groups and Periods

Question 1

Patterns

Answer 1

-rows (period)
-all elements in the same row have the same # of atomic orbitals

Question 2

Columns

Answer 2

-all elements in the same group have the same # of electrons
-the # of electrons in the outer shell controls most chemical properties, therefore these elements have similar properties

Question 3

Two at the top

Answer 3

Hydrogen
-sometimes missing an electron, and sometimes has an extra

Helium
-it’s different than all the other elements. It can only have two electrons in the outer shell. Even though it only has 2, it is still grouped w/ elements that have eight