Explanation

• Isotopes of an element have the same number of protons.
• They differ in number of neutrons, which changes mass number.
• Chemical properties remain almost the same due to same protons.

Last verified on 14-05-2026

Explanation

• Atoms are made of subatomic particles: protons, neutrons, and electrons.
• Mass number represents the total number of heavy particles in nucleus.
• Only protons and neutrons contribute to atomic mass.

Last verified on 14-05-2026

Explanation

• Atoms that have the same number of neutrons but different atomic numbers are called isotones.
• They belong to different elements because their proton numbers are different.

Additional information:

• The word “isotone” comes from Greek meaning “equal tension.”
• Isotopes belong to the same element, while isotones belong to different elements.

Last verified on 13-05-2026

Explanation

• An atom is electrically neutral when positive and negative charges are equal.
• Protons carry positive charge, while electrons carry negative charge.
• If both are equal in number, the total charge becomes zero.

Additional information:

• The nucleus contains protons and neutrons.
• Electrons move around the nucleus in energy shells.

Last verified on 13-05-2026

Explanation

• Isotones are atoms of different elements having the same number of neutrons.

• Their atomic numbers are different but neutron numbers remain equal.

• Example: Carbon-14 and Nitrogen-15 both have 8 neutrons.

• Isotones may have different chemical properties because they belong to different elements.

• The term “isotone” was introduced in nuclear chemistry studies.

Last verified on 09-05-2026