A homonuclear molecule is formed when the combining atoms are of the same element. For example two hydrogen atoms combine together and form a stable homonuclear molecule - di-hydrogen\((\text{H}_2)\). On similar lines, a heteronuclear molecule consists of atoms of different elements.
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Joining and starting a shop on Etsy is free. There are three basic selling fees: a listing fee, a transaction fee, and a payment processing fee. It costs US$0.20 to publish a listing to the marketplace. A listing lasts for four months or until the item is sold. Once an item sells, there is a 3.5% transaction fee on the sale price (not including shipping costs).