History of atoms and Isotopes

What is an atom mostly made up of?

• protons
• electrons
• empty space
• neutrons

Is the nucleus positively or negatively charged?

• positively
• negatively

What do like charges do?

• attract
• repel
• nothing

What do opposite charges do?

• attract
• repel
• nothing

What was JJ Thomson responsible for finding?

• protons
• neutrons
• nucleus
• electrons

What is Niels Bohr responsible for discovering?

• That electrons are inside the nucleus
• That electrons are in fixed orbits around the nucleus
• That electrons are small
• That electrons are negative

Ernest Rutherford discovered that the atom was mostly _________________ and has a _______________ charged nucleus.

• empty space, positively
• empty space, negatively
• full of protons, positively
• full of neutrons, negatively

John Dalton was wrong when he said that...?

• atoms are the building blocks of matter
• atoms cannot be created or destroyed
• all atoms of the same element are identical
• both b & c

JJ Thomson found that the cathode ray tubes were ________________ because they were attracted to the positive side of a magnet. 

• positive
• negative
• neutral

Which experiment taught us that atoms are mostly empty space and have a positively charged nucleus?

• Plum Pudding Model
• Cathode Ray Tube
• Gold Foil Experiment
• Planetary Model