Atomic Theory

In Greek, Democritus called these particles....

• atomos

• atoms

• greek

• particles

The name "atom" means ​ ​ (a)   in Greek.

• indivisible
• dividable
• super small
• particles
• matter

Dalton discovered that all compounds are made of ______________________

• elements

• Earth, wind, fire, and water

• molecules

• other compounds

Thomson's idea of the atom looked like chocolate chip cookies because

• negatively charged electrons were like chocolate chips stuck into positively charged cookie dough

• they were crunchy and delicious

• electrons made up the cookie and neutrons were like the chocolate chips

Thomson won a Nobel Prize for his ​ (a)   discovery.

• electron
• neutron
• proton
• lepton
• quark

Rutherford's experiment was called the:

• Aluminum foil experiment

• Gold foil experiment

• Tin foil experiment

• Chocolate chip cookie experiment

Because only a few alpha particles bounced back and were deflected, it was concluded that

• the nucleus is very dense and exists in the center of the atom

• electrons were located in the center of the atom

• the entire atom is dense

Which of the following is NOT true according to Rutherford's model of the atom?

• electrons are bunched together in the center of the atom

• the center of the atom (which contains all of its mass) is called the nucleus

• atoms are mostly empty space

Bohr's model of the atom said that electrons

• are found in the nucleus of the atom

• orbit the nucleus like planets orbit the sun

• are like chocolate chips

• are positively charged

Electrons behave like ​ (a)   .

• waves
• particles
• atoms
• molecules