The Atom

An ______ is the smallest part of an element that still holds the properties of the element

What particle was used to bombard the gold foil in the experiment Rutherford undertook to investigate atoms?

• proton

• alpha particle

• neutron

• electron

What happened to most of the alpha particles in Rutherford's experiment?

• bounced straight back

• deflected a small amount

• went straight through

What conclusions did he come to?

• atom is a lump of positive material with negative charge scattered throughout it

• atom has a tiny dense core

• atom has a positive core

• atome has a negative core

How much bigger is the atom than the nucleus

• Twice its size

• 100 times bigger

• 2000 times bigger

• 100 000 times bigger

• 10 million times bigger

What gives out a continuous spectrum?

• a hot gaseous element

• a hot incandescent solid or liquid

What gives out a line spectrum?

• a hot gaseous element

• a hot incandescent solid or liquid

Give one use of spectroscopy

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In the Bohr Model of the atom, where are the electrons found?

• fixed energy levels outside the nucleus

• randomly scattered outside the nucleus

• randomly scattered inside the nucleus

• fixed energy levels inside the nucleus

How is the Bohr model of the atom used to explain emission spectra?

Excited ________ fall from a higher energy level to a lower energy level and release electromagnetic radiation