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Group 1 and group 2 or Group 16 and group 17
the grass group
The most diverse group of gymnosperms are the conifers.
In the periodic table, the elements are grouped according to their properties. Elements in a group has an equal number of valence electrons. So the elements in a group have most common chemical properties.
refractive index and density.
The most important criteria is the similarities between chemical properties.
the most important properties in an element is state at room tempreture
group 1A
hydrogen and oxygen makes up water but i think that is the most important properties of water
penis
Fruit is not the most important food group. Grain is the most important food group.
Fluorine because it is in the same group (group 17) as Bromine therefore it has the same chemical properties
Engines
bismuth
Carbonates are the second most important mineral group.
The question is effectively meaningless.
Bismuth (Bi)