Answer:
Platinum Gold and silver are used to make jewellery because of the following reasons. They are highly lustrous metals which are resistant to corrosion. They are highly malleable and ductile so can be transformed into any shape or design.
Explanation:
The answer should be 0.5 because 6/12 is 0.5. It gives u the key equation
Lanthanide belongs to period 6, and actinides belongs to period 7
