Câu 14 : Tổng số hạt p , n , e trong 2 nguyên tử kim loại A và B là 142 , trong đó , tổng số hạt mang điện nhiều hơn tổng số hạt không mang điện là 42 , Số hạt mang điện của nguyên tử B nhiều hơn nguyên tử A là 12. Nguyên tử A và B lần lượt là

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

An atom of lithium (li) and an atom of chlorine (cl) engage in a chemical reaction. which correctly describes the structure of the resulting chemical compound? hint: consider the class of each element. the chemical compound will have a network structure. the chemical compound will have triple bonds. the chemical compound will have a ball-and-stick structure. the chemical compound will have double bonds.

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.