What is the daughter nucleus (nuclide) produced when 227ac undergoes beta decay by emitting an electron?

Hey there!:

β-decay:

Unstable nucleus undergo β-decay in which a neutron is converted into proton , so

¹₀ n  >  ₁¹p +   ₋₁⁰e    ( Z + 1 )

The complete reaction is as follows:

²²⁷₈₉AC > ²²⁷₉₀ Th  +  ₋₁⁰e

Therefore , the daughter nucleus is :  ²²⁷₉₀ Th

Hope that helps!

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

im not exactly sure but i think its b!