Which atom has a nucleus that contains 13 protons and 14 neutrons 1. mg 2. be 3. al 4. n

Al

Explanation:

Aluminium has an atomic number of 13 and a mass number of 27. Atomic number refers to the number of protons in the nucleus of an atom. The number of protons in the nucleus + the number of neutrons gives the mass number. If the mass number of aluminum is 27, that means that the number of neutrons are 14 because 13+14=27

the answer is the first option

explanation:

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chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.