...electrons, as they account for a negligible mass relative to the atom as a whole (electrons make up 1/1840th of the total mass, to be precise).
Elements with the highest atomic mass can be found towards the bottom of the periodic table, typically in the bottom rows known as the actinide and lanthanide series. These elements include heavy elements such as uranium, thorium, and plutonium.
No two elements may have the same atomic number. But two elements may have same atomic mass. Hence atomic number is better than atomic mass.
By Atomic Mass
Atomic Mass.
Gold is a meta element. Atomic Mass of it is 197.
Generally the term "atomic mass" is used for isotopes. For elements is preferred now "atomic weight".
Elements with the highest atomic mass can be found towards the bottom of the periodic table, typically in the bottom rows known as the actinide and lanthanide series. These elements include heavy elements such as uranium, thorium, and plutonium.
No two elements may have the same atomic number. But two elements may have same atomic mass. Hence atomic number is better than atomic mass.
By Atomic Mass
The molar mass of a compound is the sum of atomic weights of the contained elements in the molecule.The expression atomic weight is correct for elements; for isotopes is correct atomic mass.
Atomic Mass.
Gold is a meta element. Atomic Mass of it is 197.
Iron is a metal element. Atomic mass of it is 55.84.
I suppose that you think to atomic weights (not mass) of chemical elements and the molecular mass.
Mendeleev arranged the elements in the periodic table according to their atomic masses.
the 2kg is closest to 2020g because it is the only number that can work for this answer.
Mendeleev arranged elements in order of increasing mass. Later modern periodic table was discovered that contains elements arranged by atomic number.