Question

Ra is a radioactive element but Au not why​

Answer 1

Explanation:

Radium is a highly radioactive element and can be extremely dangerous. ... Trace amounts of radium are found in uranium ore, because radium is created from the decay of the uranium atom, which then into several other unstable elements before finally ending in the element lead

BUT WHY NOT ( AU )GOLD ?

The most common form of gold, atomic number 197, is not radioactive but the radio-isotopes with atomic numbers 195, 196, 198 and 199 are radioactive.

All gold radioisotopes are manmade and never found in nature

BONUS Q&A

Why some elements are radioactive and some are not?

The fact is, that some configurations of protons and neutrons are more stable than others (thus less radioactive). When an atom becomes unstable, it typically shoots some protons and/or neutrons out of its core. For example Uranium 235 has 92 protons and 143 neutrons in its core and is very radioactive.

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