3. Beta decay is when a proton and are emitted from a neutron.
a. an electron
b. another proton
c. a neutron
d. positron
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Ответ:
Alkaline Earth Metals are the 2nd Group of Metals on the Periodic Table.
Explanation:
Characteristics:
- Shiny
- Reactive
- Low melting and boiling points
- Low density
- 2 valence electrons
Alkaline Earth Metals cannot be found alone in nature since they are highly reactable (If you've ever thrown barium into a lake, it would cause a massive explosion).