All the elements of a family in the periodic table have what feature in common?a)they all have similar chemical properties.b)the
y all have the same number of protons in the nucleus.c)they are all located in the same horizontal row or period.d)they all have the same number of electrons in the electron cloud.
Answer: In the chemical formula for water, the subscript for hydrogen is 2. Notice that the 2 is smaller and written slightly below the H and O. It is called a subscript because it is written ("script") "below" ("sub") the preceding letter.
