When 
Ac undergoes positron emission,what is the atomic number of the element that is produced?
Definitions:
Vitamin A
An essential fat-soluble vitamin important for growth and development, immune function, and vision.
Human Papillomavirus (HPV)
A group of viruses that can cause genital warts and are associated with several cancers, including cervical cancer.
Cervical Cancer
A type of cancer that occurs in the cells of the cervix — the lower part of the uterus that connects to the vagina.
Oral Cancer
A type of cancer that develops in the tissues of the mouth or throat, often linked to tobacco use, heavy alcohol use, or the presence of human papillomavirus infection.
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