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Alisiya [41]
3 years ago
10

The nucleus of an atom of K-42 contains

Chemistry
2 answers:
ruslelena [56]3 years ago
8 0
Number of proton K => 19 
therefore, 42 - 19 = 23.

So the answer is 19 protons and 23 neutrons. 
mafiozo [28]3 years ago
4 0
The atomic number is the number of protons, while the atomic mass is the number of protons added to the number of neutrons. By definition, potassium (K) has atomic number 19, so it should have 19 protons. If it has a mass of 42, then the number of neutrons is 42 - 19 = 23 neutrons. This is choice (1).
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