Please Help 1. What is the parent isotope when Rn-218 is formed as a result of an alpha decay? A. At-212
B. Ra-88
C. Ra-222
D. Ac-228

2. What is the parent isotope when Holmium-166 is formed during an alpha decay?

A. Tm-170
B. Er-170
C. Tb-160
D. Dy-164

Which is a characteristic of the electron sea model for metallic bonding? molecular orbitals overlap to produce bands. electrons flow easily between metal nuclei. electrons are in fixed positions in the orbitals. atomic nuclei are arranged in an irregular pattern.