1. Which statement correctly describes how reactivity changes in Group 1 metals as you move down the group?
2. What does the period number of an element tell you?
3. How should a symbol equation be balanced?
Atomic nucleus — contents?
Protons and neutrons.
Isotopes — same?
Same element, different neutrons.
Mass number — sum?
Protons plus neutrons.
Atomic number — equals?
Number of protons.
Electron count — in a neutral atom?
Equal to protons.
Periodic table — group number?
Number of outer-shell electrons.
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