Answer:
a) 4.0026 amu
b) 55.845 amu
c) 207.20 amu
Step-by-step explanation:
To find the mass of an atom, it is excellent to look at the periodic table of elements.
What is the periodic table of elements?
A periodic table of elements shows a repeating pattern of properties of the elements crucial and known in the world of chemistry.
Reading the periodic table can be difficult but easy to manage with the correct amount of understanding. There are 118 elements known to science today, and all of them are contained with 4 main sectors:
- Chemical Symbol: this is what differentiates the chemical and is an abbreviation. This is what we look for when we are trying to find information about an element.
- Name: The name of the element is written under the chemical symbol.
- Atomic Number: the atomic number is the number of protons in the nucleus of an atom of that element.
- Atomic Mass: This number indicates the average mass of that atom of all the isotopes in that element.
Using this information, we need to find the atomic mass of Helium, Iron, and Lead. Consulting the periodic table of elements, the abbreviations of those elements are respectfully He, Fe, and Pb. We can find these on the periodic table to find the atomic mass, which is usually under the name of the element. It is measured in atomic mass units, or amu.