What I think is the charge of nucleus is the proton+neutron
Most are made from crystals and minerals.
Na has a +1 charge, and O has a -1 charge.
The Curies discovered radium
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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