Question

how to find an atomic number and a mass number​

Answer 1

Explanation:

Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number

Answer 2

Answer:

calculate the numbers of neutrons.now we know that atomic number =number of protons ,and mass number =number of protons +number of neutron .to find the number of neutron is an element ,subtract the atomic number from the mass number.