Different of an element have different numbers of neutrons

a) ions
b) isotopes
c) compounds
d) molecules

Different isotopes of an element have different number of neutrons.

Further ExplanationAn atom  An atom is defined as the smallest particle of an element that can take part in a chemical reaction.Atoms are made of energy shells and the inner nucleus.It is also made up of subatomic particles, protons and neutrons.Neutrons  They are sub-atomic particles in an atom that are found in the nucleus of an atom. They have a zero charge or no charge.Neutrons are slightly heavier than protons.The number of protons and neutrons in a nucleus of an atom results to the atomic mass number of an atom. Like protons they only take part in nuclear reactions.ProtonsProtons are subatomic particles that are found in the nucleus of an atom. They are positively charged. with a charge of +1.The number of protons differ from one element to another and thus used as the atomic number of an individual element.The nucleus of an atom is positively charged due to the positive charge of the protons.  Additionally, protons do not take part in chemical reactions but in nuclear reactions.Electrons  They are found orbiting the nucleus on energy shells based on Clouds’ theory. Electrons are negatively charged each with a charge of -1.The number of electrons and protons in a neutral atom are equal. Additionally they have the least mass of the three sub-atomic particles.Electrons are the only sub-atomic particles that take part in chemical reactions.Isotopes Isotopes are atoms of the same element that have the same mass number but different atomic number.Mass number;Mass number is the sum of the number of protons and neutrons in the nucleus of an atom of an element.

Keywords: Atom, sub-atomic particles, electrons, protons, neutrons, isotopes  

Learn more about:Sub-atomic particles: Electrons:Protons: Neutrons: Mass number: Atomic number:

Level: High school

Subject: Chemistry  

Topic: Atomic structure

Ibelieve the answer is b