Hydrogen [H2] is the chemical element with atomic number 1 and an atomic weight of 1.00794 u (mass unit). This is approximately 1/4 of the next lightest chemical element Helium [He], an inert gas (used in weather balloons) and with an atomic weight of 4.00260 u.
Hydrogen is fairly easy to generate and is abundant in ambient conditions. H2 is extremely flammable, a volatility that makes it difficult to store and transport.
No element has an atomic weight of 19.32 on the periodic table.
silver
Hydrogen. It has one proton and one neutron--you can't make an atom lighter than that.
The weighted average for all isotopes that occur in nature for an element is its atomic weight listed on the Periodic Table of the elements.
The metal with the lowest atomic weight is lithium, which has an atomic number of 3.
the atomic weight
Relative atomic mass, also called atomic weight, is listed on the periodic table for each element. There is no element listed on the periodic table with a relative atomic mass of 15.5.
Vanadium has an atomic weight of 50.9415 on the periodic table.
In the periodic table, period 4 elements have atomic numbers ranging from 19 (potassium) to 36 (krypton). The element with the lowest mass in period 4 is potassium (K), which has an atomic number of 19 and an atomic weight of approximately 39.1 atomic mass units.
Atomic mass - Atomic weight are the same , so look at your periodic table and below every element it will give you atomic mass.
Atomic weight
Hydrogen is the lightest substance among these four elements. It has the lowest atomic number and atomic weight, making it the lightest element on the periodic table.