Question Answer
A) What number is used to organize the Periodic Table? What does this number represent? The atomic number is used to organize the periodic table. The atomic number represents the number of protons in the atom’s nucleus.
B) Which of the following subatomic particles CANNOT vary in the atoms of a specific element: Protons, Neutrons or Electrons? Explain why. The  number of protons cannot vary in an atom because changing the number of protons because changing changes the type of element.
C) What do the elements in the same Group have in common? Elements within a group all have the same number of valence electrons in their outer shell.
D) What do the elements in the same Period have in common? Elements within a period all have the same number of electron shells (orbitals)
E) Which Group is the MOST reactive? Explain Why. Group 1 (Alkali Metals) are the most reactive because they only have one valence electron and are very unstable.
F) Which Group is the LEAST reactive?  Explain Why. Group 18(noble gases) are the least reactive because they have 8 valence electrons.They are very stable.
*What is Krypton’s atomic number? 36
Is Krypton an isotope? How do you know? Yes,because it has more neutrons than protons.There are 36 protons with a atomic mass of 85.Therefore, there are 49 neutrons.                                                                                     
*What is the name of the Group containing Krypton? The group containing Krypton is Noble Gases. Group 18.
Name 2 other elements in the same Group as Krypton .Helium and Neon are both in the same group and Krypton.
*Describe 2 common properties of elements in Krypton's Group. The noble gases are very stable.The noble gases all have 8 valence electrons.
Periodic table Recap

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