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The mass of an atom is found by adding its protons and _______.
The mass number of iodine is 126, and it’s in the 53rd place in the periodic table. It has ________________ protons and ______________ neutrons.
126 protons and 53 neutrons
53 protons and 126 neutrons
53 protons and 73 neutrons
73 protons and 53 neutrons
The atomic number of krypton (Kr) is 36, and its mass number is 84. How many neutrons does it have?
Identify the model