2. Explain what an isotope is and give two important physical properties of isotopes that make them useful in biological research. Define half-life.

isotope is a variants of a particular chemical element which differ in neutron number, and consequently in nucleon number.All isotopes of a given element have the same number of protons but different number of neutrons in each atom.The 2 important physical properties of isotope is1.Melting Points2.Boiling Points

Adozen is 12, and your needing to calculate the weight of one medium egg, so i would do 21/12=1.75 per egg, and check your answer by doing 1.75 * 12= 21 : ) : ): ): ): ) i hoped i

Answer) by studying proton collisions hope this : )