QUESTION $1$

The following diagram shows the nuclei of two different atoms, where blue spheres represent protons and green spheres represent neutrons.

HIUIII I

HIUIII II

What is the atomic number of atom I?

What is the atomic number of atom II$?$

What element is atom I? Enter the full element name.

What element is atom II$?$ Enter the full element name

Are these atoms isotopes? Enter yes or no

What is the mass number of atom I?

What is the mass number of atom II$?$