Who was the ancient Greek philosopher that first proposed the idea of atoms?

• Aristotle

• Democritus

• John Dalton

• J.J. Thompson

Which Quaker teacher challenged Aristotelian theory and showed that substances always break down into the same elements?

• Aristotle

• Democritus

• John Dalton

• J.J. Thompson

Who discovered the electron in 1897?

• Aristotle

• Democritus

• John Dalton

• J.J. Thompson

What did J.J. Thompson's model of the atom propose?

• Atoms are made up of tiny particles surrounded by empty space

• Atoms are uniformly packed spheres of positive matter filled with negatively charged electrons

• Atoms consist largely of empty space with a dense, positively charged nucleus

• Electrons orbit the nucleus at fixed energies and distances

What did Ernest Rutherford's gold foil experiment reveal about atoms?

• Atoms are made up of tiny particles surrounded by empty space

• Atoms are uniformly packed spheres of positive matter filled with negatively charged electrons

• Atoms consist largely of empty space with a dense, positively charged nucleus

• Electrons orbit the nucleus at fixed energies and distances

Who expanded on Rutherford's nuclear model and proposed that electrons orbit the nucleus at fixed energies and distances?

• Aristotle

• Democritus

• Niels Bohr

• Werner Heisenberg

What did Werner Heisenberg's uncertainty principle state?

• Atoms are made up of tiny particles surrounded by empty space

• Atoms are uniformly packed spheres of positive matter filled with negatively charged electrons

• Atoms consist largely of empty space with a dense, positively charged nucleus

• It is impossible to determine both the exact position and speed of electrons

What does the current quantum model of the atom propose?

• Atoms are made up of tiny particles surrounded by empty space

• Atoms are uniformly packed spheres of positive matter filled with negatively charged electrons

• Atoms consist largely of empty space with a dense, positively charged nucleus

• Electrons cannot be pinpointed but exist within a range of possible locations

What happens when electrons circling an atom shift between energy levels?

• They absorb or release energy in the form of specific wavelengths of light

• They change their size and shape

• They combine with other atoms to form compounds

• They become positively charged

Tags

NGSS.HS-PS4-3

What did Democritus propose about the nature of atoms?

• Atoms are made up of tiny particles surrounded by empty space

• Atoms are uniformly packed spheres of positive matter filled with negatively charged electrons

• Atoms consist largely of empty space with a dense, positively charged nucleus

• Atoms cannot be created or destroyed