When the total number of protons and neutrons present in an atomic nucleus is added, they give the mass number of that atom. It is also known as the atomic mass number as well as the nucleon number. The mass number is denoted with the letter A. The difference between the mass number and the atomic number gives us the total number of neutrons present in an atom (neutrons = A – Z).
It is usually written to the left of the symbol of the element in the form of a superscript. The isotopes are such forms of the same element which have different mass numbers. The mass numbers vary due to the presence of a different number of neutrons in them.
If a 6.13-g sample of an isotope having
In a nuclear equation, both the mass number and the ______
The decay series from uranium-238 to lead-206 is
True or false? The mass number of a nucleus represents the
When a nucleus undergoes ______, the mass number of the nucleus decreases
Write the atomic symbol / for each of the isotopes described below
Complete the following table. /
When a nucleus emits a neutron, does the atomic number of
Although naturally occurring potassium consists mostly of the isotope of mass number
What is a positron? What are the mass number and charge
