If a claim for an elective share is made, the surviving spouse is entitled to (i) one-third of the decedent’s augmented estate if the decedent left surviving children or their descendants or (ii) one-half of the decedent’s augmented estate if the decedent left no surviving children or their descendants. The surviving spouse is entitled to interest at the legal rate specified in § 6.2-301 from the date of the decedent’s death to the date of satisfaction of the elective share.