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Chapter 3 Test

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Questions	Answers
The atomic number of an element is determined by the number of	protons
The rows in the periodic table are called	periods
Of the following, the group that contains the most reactive elements is	alkalai metals
Unstable nuclei that release fast-moving particles and energy are	radioactive
Unlike metals, solid nonmetals are	dull and brittle
Elements that are gases at room temperature are likely to be classified as which of the following?	nonmetals
Radioactive isotopes give off radiation that can be detected. This property makes them useful in which of the following ways?	all of the above