Chemical Properties of Matter (8.5B, 8.5C)

Group vs. Period Organize the elements below into groups and periods In The Same Group F Cl At In The Same Period Te Pd Sr What are Valence Electrons? How many valence electrons? Circle the valence electrons. Watch this video on reactivity and the Periodic Table Watch this demonstration of the reactivity of Group 1 elements, the Alkali Metals Elements in the same _ share the same reactivity. Group Period Neither Reactivity is basically... how likely an atom is to explode how likely an atom is to be electrically charged how likely an atom is to bond with another atom how likely an atom is to respond to water In atoms, reactivity is related to the number of protons in the nucleus the number of valence electrons in the outside ring the total number of electrons in the electron cloud the number of neutrons in the nucleus On the Periodic Table, we can quickly determine the reactivity of a particular element by looking at its period number, which is equal to the number of valence electrons group number, which is equal to the number of electron shells in an atom period number, which is equal to the number of electron shells in an atom group number, which is equal to the number of valence electrons Click the blue dots and label the areas using these words:most reactivevery reactiveleast reactive most reactive very reactive least reactive You can draw Bohr models to find valence electrons, or use THIS shortcut! In the table below, fill in the number of protons, electrons, group number, valence electrons and energy shells for each element (look at your periodic table!) Element Name Number of Protons Number of electrons Group number Number of valence elcetrons Number of Energy Shells Rubidium (Rb) 37 37 1 1 5 Boron (B) 5 5 3 3 2 Bromine (Br) 35 35 7 7 4 Krypton (Kr) 36 36 8 8 4 Oxygen (O) 8 8 6 6 2 Neon (Ne) 10 10 8 8 2 Sort the elements from above into the Most Reactive and Least Reactive groups Most Reactive Rubidium (Rb) Bromine (Br) Least Reactive Krypton (Kr) Neon (Ne) In the question above, how did you know which elements were the most reactive and least reactive? Which of the following models shows the most reactive element? Fill in the blanks below: On the Periodic Table, reactivity can be determined by looking at the group number. Reactivity in this cases refers to the tendency of an atom to bond with another atom. The amount of reactivity in an atom is tied to the number of valence electrons in the atoms outer shell. Elements in group 1 are the most reactive, with elements in group 7 being very reactive. Elements in group 8 are very stable and do not bond with other atoms easily.