The first one is the answer
isotopes of an atom have different number of neutrons . the number of protons are not different in isotopes of an atom
Answer:
The metal that spontaneously reacts with NiCl₂ is Zn solid.
Explanation:
The top number on elements in the periodic table is the atomic number, so when you look at the periodic table you can see that 42 is Mo (Molybdenum), and this is the only element with that atomic number.
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Clap your hands each part word you eat and you will get your answer.
