Most of the stars plotted on a H-R diagram are red giant stars white dwarfstars

Question

Most of the stars plotted on a H-R diagram are
      red giant stars
       white dwarfstars
       cepheidvariables
       main sequencestars


. What are alpha particles?
       hydrogennuclei
       electromagneticradiation
       electrons
       helium nuclei


What type of reaction has the general form XY X +Y.
       ion exchange
       replacement
       decomposition
       combination


Each family, or group of elements in a vertical column of theperiodic table has elements with chemical characteristics thatare
       exactly thesame.
       similar.
       different.
       exactlyopposite.

Explanation / Answer

Most of the stars plotted on a H-R diagram are Main sequence stars (It's not really chemistry, I had togoogle this one) What are alpha particles? Helium Nuclei (they are often written with the symbolHe) What type of reaction has the general form XY X +Y. Decomposition (as the XY compound is falling apart, ordecomposing, into X and Y) Each family, or group of elements in a vertical column of theperiodic table has elements with chemical characteristics thatare Similar (they are obviously not all exactly the same,but they are grouped together for a reason)

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