What element contains 11 protons 11 electrons and 12 neutrons?

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The correct answer is 23.

• The mass number is the total of the protons and neutrons together, and it is given the symbol A.

• Example: A sodium atom contains 11 protons and 12 neutrons; its mass number is 23.

• The atomic number is the number of protons in the nucleus of an atom.
  • The number of protons determines how many electrons surround the nucleus, and it is the arrangement of these electrons that determines most of the chemical behaviour of an element.
  • Atomic number, the number of a chemical element in the periodic system, whereby the elements are arranged in order of increasing number of protons in the nucleus.
  • Accordingly, the number of protons, which is always equal to the number of electrons in the neutral atom, is also the atomic number.
  • The atomic symbol is used to identify the element to which an atom belongs and the number of electrons, protons, and neutrons it contains.

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If you have 11 protons and 12 neutrons this is an atom of what element?

Any atom that contains exactly 11 protons is an atom of sodium. The number of neutrons does not play a role in determining which element an atom is.

Author:

Steve Gagnon, Science Education Specialist (Other answers by Steve Gagnon)

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An atom of an element has 11 protons, 11 electrons and 12 neutrons. What is the the atomic mass?

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