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The mass number of a carbon atom that has 6 protons and 12 nucleons is:
12
20
Isotopes
20
20
The same number of protons
11
Atoms of different elements.
The mass number of the element neon Ne (Z=10, A=20) is:
12
20
Isotopes
20
20
The same number of protons
11
Atoms of different elements.
Isotopes have:
12
20
Isotopes
20
20
The same number of protons
11
Atoms of different elements.
The mass number of a fluorine atom that has 9 protons, 9 electrons and 11 neutrons is:
12
20
Isotopes
20
20
The same number of protons
11
Atoms of different elements.
X (Z=13, A=27) and X (Z=14, A=27):
12
20
Isotopes
20
20
The same number of protons
11
Atoms of different elements.
The atomic number of a sodium atom that has 11 protons, 11 electrons and 12 neutrons is:
12
20
Isotopes
20
20
The same number of protons
11
Atoms of different elements.
Mg (Z=12, A=23) and X (Z=12, A=25):
12
20
Isotopes
20
20
The same number of protons
11
Atoms of different elements.
The atomic number of the element calcium Ca (Z=20, A=40) is:
12
20
Isotopes
20
20
The same number of protons
11
Atoms of different elements.
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