The basic units for density is $\frac{mass}{volume}$ and any get of units that has those units in the proper place can be considered a density unit. The ones that has those specifically are A, B, E and F

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3 years ago

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How did knowing the number of valence electrons in one

Orlov [11]

Explanation:

Knowing the number of valence electrons in one of the alien elements helps in identifying it because the number of valence electrons can help categorize the alien element. Similar elements have the same valence electrons and knowing the category of the element can help further analyze the element.

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3 years ago

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Which sequence of atomic numbers represents elements that have similar chemical proprieties

Kazeer [188]

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3 years ago