3. What is an isotope?

one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties

Explanation:

what is an isotope? isotopes are versions of the same element. They have the same number of protons and electrons as the element but different mass numbers and number of neutrons.

Explanation:

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away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.