study guide 4 & 5

1.     What are the assumptions in Dalton’s atomic theory

• Matter is made of tiny, indivisible particles called atoms.

• Most of the atom is empty space with a tiny, dense, positively charged nucleus.

1.     Which concepts in Dalton’s theory has been modified

• Atoms of a specific element are identical.

• Most of the atom is empty space with a tiny, dense, positively charged nucleus.

1.     What parts of Dalton’s theory still hold true today

• Chemical reactions involve rearrangement of atoms.

• j

1.     Because most particles fired at metal foil passed straight through Rutherford was able to conclude what as part of his gold foil experiment

• Most of the atom is empty space with a tiny, dense, positively charged nucleus.

• j

1.     Which scientist is responsible for discovering the neutron

• James Chadwick

• j

1.       What is the location and charge and relative mass of the three subatomic particles

• +1 charge, 1 unit mass, found in the nucleus

• j

1.     What are the characteristics of the nucleus

• No charge, 1 unit mass, found in the nucleus

• h

1.     Why are atoms electrically neutral

• -1 charge, very small mass, found around the nucleus

• j

1.     Most of the volume of an atom is occupied by which of the three subatomic particles

• Electrons

• j

1.     What are isotopes

• Atoms of the same element with different numbers of neutrons.

• j