Which of these is one similarity of the elements in the first group of the periodic table? A.
The elements in the group have similar atomic masses.
B.
The elements in the group have the same number of electrons.
C.
The elements in the group are very unreactive metals.
D.
The elements in the group react with oxygen in similar ways.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.