Isotopes

• Isotopes are atoms of the same element that have different number of neutrons. (In order for them to be atoms of the same element, their number of protons would be the same)

Example:

is an isotope of chlorine that has 17 protons and 18 neutrons

is an isotope of chlorine that has 17 protons and 20 neutrons

• Generally, isotopes behave the same way during chemical reactions.
• The extra neutrons just change the mass of the atom and its density.

Some of the atoms of certain isotopes are unstable because of the extra number of neutrons, and they are said to be radioactive.

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