Which of the following is true about an atom of gold and an atom of silver? both have the same mass. they have different properties. they have different sub-atomic particles. both have an equal number of sub-atomic particles.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.