19
Except noble gases the groups of elements in periodic table have the similar chemical properties but not the physical.
More than two sets of chromosomes
H2O consists of two Hydrogen and one Oxygen. Three sets of these would mean 9 atoms in your three molecules of water.
A polyploid
Two sets for twelve chromosomes.
one set
it has 2 sets of chemical properties
3-4
In Hades Realm on the River Styx, each set of hazards has a rock, a flaming skull, and a river monster. Usually there are 4 sets but there can be 5 sets.
You need several different properties in order to classify a material as a heterogeneous mixture.
geometry
This would be Geometry.
Subtraction and addition are not properties of numbers themselves: they are operators that can be defined on sets of numbers.
because pack you this not the answer geometry
Two sets of parallel lines meeting at right angles.
Mathematics
I like the way she sets the table. I have three chess sets. That boat sets high on the water.