Question

Alom A has an atomic number of 19 and mass number of 40 Atom B has an atomic number of 20 and a mass number of 40 Which of these is an accurate statement?​

Answer 1

Answer: Atom A has one less atom then atom B

Step-by-step explanation:

I took the test and made a 100

Answer 2

Statement 2-Atom B has an atomic number of 20 and a mass number of 40

Step-by-step explanation:

mass number = the sum of protons and electrons

Atom A would be an isotope ( which I don't think exist )