Q2 Using a copy of the periodic table, pick the odd one out for each of the lists a)to f) and explain why it's different from all the others. a) Magnesium, aluminium sodium, silicon: __ b) Ca, Cu, Cl , Cs: __ ....... c) Cl, Br, O, I;-........... __ d) Helium, argon, hydrogen krypton:-..................in __ e) Li, Na, K . Fe __ ................................................................................... D Lithium, nitrogen, oxygen carbon:- __

# Explanation:## a) Magnesium, aluminium, sodium, silicon:### Step 1: Identify the group and period of each element.- Magnesium (Mg) is in Group 2, Period 3.- Aluminium (Al) is in Group 13, Period 3.- Sodium (Na) is in Group 1, Period 3.- Silicon (Si) is in Group 14, Period 3.### Step 2: Determine the odd one out.- Sodium (Na) is the only alkali metal (Group 1), while the others are either alkaline earth metals (Group 2) or metalloids (Groups 13 and 14).## b) :### Step 1: Identify the group and period of each element.- Calcium (Ca) is in Group 2, Period 4.- Copper (Cu) is in Group 11, Period 4.- Chlorine (Cl) is in Group 17, Period 3.- Cesium (Cs) is in Group 1, Period 6.### Step 2: Determine the odd one out.- Chlorine (Cl) is the only nonmetal, while the others are metals.## c) :### Step 1: Identify the group and period of each element.- Chlorine (Cl) is in Group 17, Period 3.- Bromine (Br) is in Group 17, Period 4.- Oxygen (O) is in Group 16, Period 2.- Iodine (I) is in Group 17, Period 5.### Step 2: Determine the odd one out.- Oxygen (O) is the only element not in Group 17 (halogens).## d) Hellium, argon, hydrogen, krypton:### Step 1: Identify the group and period of each element.- Helium (He) is in Group 18, Period 1.- Argon (Ar) is in Group 18, Period 3.- Hydrogen (H) is in Group 1, Period 1.- Krypton (Kr) is in Group 18, Period 4.### Step 2: Determine the odd one out.- Hydrogen (H) is the only element that is not a noble gas (Group 18).## e) Li, :### Step 1: Identify the group and period of each element.- Lithium (Li) is in Group 1, Period 2.- Sodium (Na) is in Group 1, Period 3.- Potassium (K) is in Group 1, Period 4.- Iron (Fe) is in Group 8, Period 4.### Step 2: Determine the odd one out.- Iron (Fe) is the only transition metal, while the others are alkali metals (Group 1).## f) Lithium, nitrogen, oxygen, carbon:### Step 1: Identify the group and period of each element.- Lithium (Li) is in Group 1, Period 2.- Nitrogen (N) is in Group 15, Period 2.- Oxygen (O) is in Group 16, Period 2.- Carbon (C) is in Group 14, Period 2.### Step 2: Determine the odd one out.- Lithium (Li) is the only metal, while the others are nonmetals.# Answer:a) Sodium (Na) - It is the only alkali metal.b) Chlorine (Cl) - It is the only nonmetal.c) Oxygen (O) - It is the only element not in Group 17.d) Hydrogen (H) - It is the only element that is not a noble gas.e) Iron (Fe) - It is the only transition metal.f) Lithium (Li) - It is the only metal.