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Why are isotope used and what are they used for?
Isotope is 2 or more atoms having the same atomic number but different mass numbers. I hope this answers your question my friend.
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What did hydrogen used to be used for?
The only answer that comes to mind is "Airships". Hydrogen, the lightest element, was used in airships, where excess weight was undesirable. However, accidents like the Hindenburg disaster showed...
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Why is a model airplane used and where it is used?
A model aeroplane is used for presentations and testing. Model planes are also used for fun. They are used model-plane clubs, aeroplane company headquarters and studios. (Bedroom, in my house)
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What is used for fungi used on pizzas?
Porcini, baby portabello, and regular white mushrooms are common pizza toppings.
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Who used Runic symbols and what were they used for?
The ancient Germanic tribes and the ancient Scandinavians used runes as an alphabet. Prior to that, they used runes for magic purposes, such as casting lots (divination) and spells of protection.