रासायनिक प्रतीक तत्वों के मानकीकृत निरूपण होते हैं। निम्नलिखित में से कौन सा युग्म सही रूप से सुमेलित है?

'Natrium' is the Latin name for which chemical element?

What is the Latin name for Potassium, from which its chemical symbol 'K' is derived?

The modern system of using one or two letters of the name of an element as its chemical symbol was suggested by: