The 2400 Year Search for the Atom

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

• empty space
• invisible
• very small
• indivisible

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NGSS.MS-PS1-1

Which philosopher stated that matter was made of four elements: earth, wind, water and fire?

• Aristotle
• Democritus
• Plato
• Socrates

Dalton showed that common substances always broke down into _____

• the same elements in the same proportions
• elements in equal quantities
• hydrogen and oxygen
• earth, wind, water and fire

Dalton proposed that atoms _____

• could be created and destroyed
• could be created but not destroyed
• could be destroyed but not created
• could neither be created nor destroyed

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Dalton concluded that the various compounds were combinations of atoms of different _____

• facets
• materials
• elements
• ingredients

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

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

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

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

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Soon after Bohr's planetary model took center stage, experiments showed that electrons behaved _____

• as particles but not waves
• as waves but not particles
• as both particles and waves
• as neither particles nor waves

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

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