Do Now Write down your homework in your

Do Now • Write down your homework in your agenda. • Update your table of contents Page # Title Date 54 Who do you agree with? 11/12/14 55 Atomic Model HW 11/12/14 • Review the foldable on page 53 • Title the left page 52, “Who do you agree with? ”

Entrance: What do you think the model of the atom is like? • Jane: I think there would be a tiny, dense center surrounded by a lot of empty space where some particles are whizzing around it. • Hal: I think there would be a large center made up of mostly empty space with particles whizzing around it. It would be surrounded by a dense shell. • Katie: I think there would be all empty space with many tiny particles whizzing around through all that space. • Jeb: I think it would look like a tiny, dense sphere with tiny particles tightly packed inside it. • Dara: I think it would look like a lot of tiny spheres, all touching with no space in between them.

John Dalton • Atoms cannot be created, divided, or destroyed. • Atoms cannot be converted from one element to another element. • Atoms of one element are identical to each other but different from atoms of another element.

J. J. Thomson

J. J. Thomson • Discovered the electron (negatively charged) • Proposed the chocolate chip cookie model/ plum pudding model

Rutherford

Rutherford

Rutherford and Chadwick • Rutherford discovered that the nucleus, located in the center of the atom, contained the positive charge (protons). • Chadwick discovered that the nucleus also contained neutrons, which have no charge.

Today’s atomic model • Instead of orbits, electrons form an electron cloud surrounding the nucleus. • The nucleus has protons and neutrons • It is impossible to know where an electron is or how fast it is moving. We can only know the likelihood of finding an electron in a given location.

Today’s atomic model

Scientists Card Sort! • Using only your group members, correctly sort all scientists with their correct years and discoveries.

Where are the Women? • The reasons you don’t see women scientists much in textbooks. – Unequal education – Sexist culture – Suppression of female scientists. • Extra Credit Assignment: Research a female scientist. –Write a paper or create a presentation –The depth and detail you go into will determine it’s point value. –Extra points if you teach me about someone I didn’t know about. • Rosalind Franklin, Rachel Carson, Annie Jump Cannon • Roger Arliner Young, Florence Barbara Seibert • Ruby Hirose, Chien-Shiung Wu