Radium-214 decays in an alpha decay. a. what is the mass number of the daughter isotope

The mass number of daughter isotope (Radon) is 210 u

Explanation:

Alpha decay is defined as the decay process in which alpha particle is released. In this process, a heavier nuclei decays into a lighter nuclei. The alpha particle released carries a charge of +2 units and a mass of 4 units.

In this decay process, the atomic number of the atom decreases by 2 units and the mass number decreases by 4 units.

The chemical equation for alpha decay of Radium-214 isotope follows

The daughter isotope formed is Radon-210. The mass number of formed isotope is 210 u

Hence, the mass number of daughter isotope (Radon) is 210 u

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.