How many neutrons does element X have if its atomic number is 38 and its mass number is 92?

The answer to your question is Neutrons = 54

Step-by-step explanation:

Data

Number of neutrons = ?

Atomic number = 38

Mass number = 92

Definition

The Mass number is the number of protons + the number of neutrons

The Atomic number is the number of protons in an atom

Then, considering the previous definitions,

Number of neutrons = Mass number - Atomic number

- Substitution

Number of neutrons = 92 - 38

- Result

= 54