An atom has 11 protons and 12 neutrons. What is its mass number?, 23, 1, 11, 12, Two atoms are considered isotopes if they have the same number of ______ but different numbers of ______., neutrons; protons, protons; electrons, electrons; protons, protons; neutrons, Carbon-12 and Carbon-14 are both isotopes of Carbon. What is the main difference between them?, Carbon-14 has two more protons than carbon-12, Carbon-14 has two more electrons than carbon-12, Carbon-14 has two more neutrons than carbon-12, Carbon-12 is a metal while Carbon-14 is a non-metal.

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