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Question

An element X has mass number 23 and atomic number 11

state the number of an electron revolving around the nucleus


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Solution

Atomic number { Z} — The total number of an electron or proton in a neutral atom is considered an atomic number

  • The chemical properties of an element are determined by the number of protons in the nucleus
  • It is also known as the nuclear charge number
  • Atomic number = The total number of electrons or the total number of protons in a neutral atom.
  • Number of neutrons = mass number {A} - atomic number {Z}

Sodium is a chemical element with the symbol Na

  • Its atomic number is 11 and its mass number is 23, it belongs to group 1.
  • It is a soft, silvery-white highly reactive alkali metal
  • Proton and neutron are present in its nucleus and all the electron revolve around the nucleus.
  • There are a total of 11 electrons in an element X i.e. sodium (Na)

So, a total of 11 electrons are revolving around the nucleus


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