Atoms and Elements — Test Answers

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Which substance is she most likely measuring?

carbon- 14

cobalt- 60

rubidium- 91

iodine- 131

What experimental evidence led scientists to change from the previous model to this one?

Cathode rays were bent in the same way whenever a magnet was brought near them.

The colors of light emitted from heated atoms had very specific energies.

A few of the positive particles aimed at a gold foil seemed to bounce back.

Experiments with water vapor showed that elements combine in specific proportions.

What could be done to change this carbide ion to a neutral carbon atom?

add 4 electrons

remove 4 electrons

remove 2 electrons

add 2 electrons

Rounded to the nearest whole number, how many electrons are in an atom of zirconium?

131

These four elements are most likely in group

15.

16.

17.

18.

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