Mass Number Chemistry Example 4

Follow the full solution, then compare it with the other examples linked below.

Example 4

easy
Find the mass number of an atom with 26 protons and 30 neutrons.

Solution

  1. 1
    Mass number A=A = protons ++ neutrons.
  2. 2
    A=26+30=56A = 26 + 30 = 56. This is iron-56 (56Fe{}^{56}\text{Fe}).

Answer

A=56A = 56
Simply add protons and neutrons to obtain the mass number.

About Mass Number

The total count of protons and neutrons (collectively called nucleons) in an atom's nucleus, always a whole number, used to identify specific isotopes of an.

Learn more about Mass Number →

More Mass Number Examples

Example 1 easy

An atom has 17 protons and 18 neutrons. What is its mass number and what element is it?

Example 2 medium

Why is the atomic mass of chlorine listed as [formula] amu on the periodic table, rather than a whol

Example 3 medium

An isotope has 26 protons and 30 neutrons. What is its mass number? Identify the element.

Example 5 easy

An atom has 17 protons and 18 neutrons. What is its mass number?

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