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Question

Which of the following symbols represents the atomic number of an element ?


A

Z

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B

p

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C

e

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D

A

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Solution

The correct option is A

Z


The explanation for the correct option

Option A

  • The total number of protons present in the nucleus of an atom is called the atomic number.
  • It has the symbol “Z”.
  • All the isotopes have the same atomic number.
  • All the isobars have different atomic numbers.

The explanation for the incorrect answer

Option B

  • Every atom is composed of a positively charged subatomic particle called protons.
  • Protons are represented by the letter “p”.
  • Protons are present inside the nucleus of an atom.
  • The number of protons in an atom equals to its atomic number (Z).

Option C

  • Every atom is composed of a negatively charged subatomic particle called electrons.
  • Electrons are represented by the letter “e”.
  • Electrons are revolving around the nucleus in a definite circular path called shells or orbit.
  • For a neutral atom, the number of electrons equals to the number of protons.

Option D

  • The total number of protons and neutrons present in the nucleus of an atom is called the mass number.
  • It has the symbol “A

Thus, option A is the correct answer. Z represents the atomic number of an element.


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