The first element with an atomic mass greater than 100 is Ruthenium (Ru).
Atomic mass refers to the mass of a single atom, the quantity of matter contained in the atom. In other words, atomic mass is the average mass of the atoms of an element.
- To get the mass of an atom, the formula is mass number = protons + neutrons.
- Atomic mass is measured in atomic mass unit/ amu.
- Now, the element with an atomic mass nearest to 100 is Technetium (Tc), with an atomic number of 43 and atomic mass of 98.
- The element next to Tc is Ruthenium, atomic number 44 with an atomic mass of 101.07.
In the periodic table, the elements are arranged in the order of their atomic numbers. In that sequence, the first element to have an atomic mass greater than 100 is Ruthenium (Ru), with atomic number 44.
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