Examlex
Which element in group 6A is not found in compounds with an expanded valence shell?
Active Transport
The movement of substances across cell membranes against a concentration gradient, requiring energy expenditure by the cell.
Cryptocurrency
A digital or virtual currency that uses cryptography for secure financial transactions, and operates independently of a central bank.
Public Ledger
A ledger available to the public that records all transactions in a network, commonly associated with blockchain technology.
Codec
A device or program that compresses data to enable faster transmission and decompresses received data.
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