Biết tổng số hạt proton, nowtron và electron trong nguyên tử X là 82 và số hạt noton bằng 15/13 số hạt proton. Xác định nguyên tử X

The minerals found in bones are deposited by living cells called

Which metal exist in liquid state and can be cut with knife ?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.