What determines which element an atom is ? The number of neutrons
The number of electrons
The size of the atom
The number of protons

The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the number of neutrons in any atom is its mass number minus its atomic number.

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organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.