Atomic Structure, Scientists and Chemical Families

Who first proposed that everything in the world was made up of tiny particles?

• Aristotle
• Democritus
• Plato
• Socrates

Democritus called the tiniest particles of matter "atomos", which is Greek for _____

• empty space
• invisible
• very small
• indivisible

The electron was discovered in 1897.  Who discovered it?

• Ernest Rutherford
• John Dalton
• J. J. Thomson
• Niels Bohr

Whose model showed atoms as uniformly packed spheres of positive matter filled with negatively charged electrons?

• J. J. Thomson
• John Dalton
• Ernest Rutherford
• Niels Bohr

Which scientist became known as "the father of the nuclear age"?

• J. J. Thomson
• John Dalton
• Ernest Rutherford
• Niels Bohr

Whose experiment involved shooting small, positively charged alpha particles at a sheet of gold foil?

• J.J. Thompson
• Max Planck
• Ernest Rutherford
• Niels Bohr

Rutherford referred to the center of the atom, where the mass was concentrated, as _____

• the kernel
• the nucleus
• the focus
• the heart

Who drew on the work of Planck and Einstein to develop the planetary model of the atom?

• John Dalton
• Niels Bohr
• J. J. Thomson
• Ernest Rutherford

Who showed it was impossible to determine both the exact position and speed of electrons as they moved around an atom?

• Werner Heisenberg
• Niels Bohr
• Max Planck
• Albert Einstein

The current model of the atom, where electrons exist within a range of possible locations, is called _____

• the chocolate chip cookie model
• the plum pudding model
• the quantum model
• the planetary model