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It has the same number of protons, otherwise it wouldn't be uranium.The number of protons in the nucleus of an atom is called its atomic number.
From this partitioning, the mantle will become depleted in Rb relative to Sr.
The time interval it takes for the parent atoms to decay by half is always the same, no matter how much of the parent element remains.
This constant length of time is called the Some common rocks are weakly radioactive.
In some parent-daughter pairs, the daughter is still radioactive and subject to further decay to a new daughter.
In other cases, decay yields a daughter that is non-radioactive (stable) and will remain unchanged for the rest of time.