Chemistry: Precision and Design - Flashcard 4 (Sections 2.3-2.4)

Front

During a science fair, Lily set up an experiment where she shot tiny balls at a thin sheet of gold foil, expecting them to pass straight through. What unexpected observation did Lily make that led her to question the existing model of the atom?

Back

The foil reflected some balls back.

Front

Which subatomic particle has zero electrical charge? Options: nucleon, proton, neutron, electron.

Back

neutron

Front

Which subatomic particle is the lightest?

Back

electron

Front

What are atoms of the same element that differ in their mass numbers?

Back

isotopes

Front

What is the name for the number of protons in an atom?

Back

atomic number

Front

Atomic symbol for a neutral sulfur atom with 16 protons and 18 neutrons.

Back

34/16 S

Front

How many electrons are in the ion 56/26 Fe3+?

Back

23