Imagine an element that has 15 protons, 16 neutrons, and 18 electrons. Which of the following would NOT be considered an isotope of this element? * 15 protons, 16 neutrons, and 15 electrons
15 protons, 17 neutrons, and 15 electrons
15 protons, 15 neutrons, and 18 electrons

Explanation:

Option 1 15. Proton 16 neutron 15 electron

Isotopes have same atomic no but different atomic mass

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

what is the question here. i think you messed up.