Question(s) of the Day Rules You must work alone You may not use your textbook today You have 5 minutes to complete the QOD Good luck!!

Questions of the Day 1)Here is a representation of a molecule of water (H 2 O). Does it respect the principles behind Dalton’s atomic model? Explain your answer. 2) Match a characteristic of the Rutherford-Bohr atomic model with each of the following statements a)An atom contains as many protons as electrons a)Alpha particles pass easily through gold foil

Answers 1) Here is a representation of a molecule of water (H 2 O). Does it respect the principles behind Dalton’s atomic model? Explain your answer. No, this figure does not represent a water molecule correctly according to Dalton’s atomic model. Dalton believed that the atoms of different elements have different masses and dimensions. The hydrogen atoms should therefore look different from the oxygen atom.

Answers 2) Match a characteristic of the Rutherford-Bohr atomic model with each of the following statements a) An atom contains as many protons as electrons Answer: An atom is electrically neutral

Answers 2) Match a characteristic of the Rutherford-Bohr atomic model with each of the following statements b) Alpha particles pass easily through gold foil Answer: An atom is mostly empty space

What are we doing Today? QOD (question of day) Workbook Questions: any questions? Finish off families of periodic table Representing atoms: Lewis Structures Lewis structure worksheet Molecule building fun Day End Question(s)

What are we doing Today? Opportunity with Ecology & the Environment

Alkaline Earth Metals They are never found uncombined in nature. They have two valence electrons. Alkaline earth metals include magnesium and calcium, among others.

Halogen Family The elements in this family are fluorine, chlorine, bromine, iodine, and astatine. Halogens have 7 valence electrons Halogen atoms only need to gain 1 electron to fill their outermost energy level.

Noble Gases Noble Gases are colorless gases that are extremely un- reactive. One important property of the noble gases is their inactivity. They are inactive because their outermost energy level is full. Because they do not readily combine with other elements to form compounds, the noble gases are called inert.

Rare Earth Elements The thirty rare earth elements are composed of the lanthanide and actinide series. Many are synthetic or man- made. (Plutonium)

Atoms are small. How do we represent them?

Periodic Table Study Guide How to Draw Lewis Structures

Lewis Structures 1)Find your element on the periodic table. 2)Determine the number of valence electrons. 3)This is how many electrons you will draw.

Lewis Structures Find out which group (column) your element is in. This will tell you the number of valence electrons your element has. You will only draw the valence electrons.

Groups - Review Each column is called a “group” Each element in a group has the same number of electrons in their outer orbital, also known as “shells”. Except for He, it has 2 electrons The electrons in the outer shell are called “valence electrons”

Lewis Structures 1)Write the element symbol. 2)Carbon is in the 4 th group, so it has 4 valence electrons. 3)Starting at the right, draw 4 electrons, or dots, counter- clockwise around the element symbol.

Lewis Structures 1)Check your work. 2)Using your periodic table, check that Carbon is in the 4 th group. 3)You should have 4 total electrons, or dots, drawn in for Carbon.

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

Lewis Structures On your worksheet, try these elements on your own: a)H b)P c)Ca d)Ar e)Cl f)Al

To Do -Finish the lewis structure work page -Make sure workbook is complete 3,4 & 7,8 -Have fun

Day End Question (DEQ) 1)Which positively charged particle is found in the nucleus? 2)What are the elements (family) in the second column of the periodic table called? 2)What are the elements (family) in the far right column of the periodic table called?

Answers 1) Which positively charged particle is found in the nucleus?. The proton

Answers 3) What are the elements in the second column of the periodic table called?. Alkaline earth metals.

Answers 4) What are the elements in the far right column of the periodic table called?. Noble Gases