Unit 2 Notes / Vocab 1

Front

Anything that takes up space and has mass.

Back

matter

Front

Atom has a small, dense, positively charged center.

Back

Ernest Rutherford

Front

Scientist who proposed a new atomic model after discovering the electron in 1897.

Back

Thomson

Front

Electrons move around the nucleus in circular orbits.

Back

Bohr

Front

Elements that are shiny, conduct electricity and heat, found left of the zig-zag line.

Back

metal

Front

Positive charge?

Back

proton

Front

Law of conservation of matter: total matter ______________ after change. Discovered by ____________.

Back

stays the same; Lavoisier

Front

Location of electrons around the nucleus

Back

Electron Cloud

Front

Discovered the neutron in the atom

Back

Chadwick

Front

Horizontal rows on the periodic table are called _____, and all elements in a row have the same number of _____ _____.

Back

periods; energy levels