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An atom W has 17 electrons and 18 neutrons. Which of the following representations of...

Chemistry
WAEC 2014

An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?

  • A. 1718W
  • B. 1817W
  • C. 3517W
  • D. 3518W
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Correct Answer: Option C
Explanation

The superscript is the atomic mass = 35

(The mass number also called atomic mass number or nucleon number, is the total number of protons and neutrons)

 

The subscript is the atomic or proton number = 17

The number of electrons in a neutral atom is equal to the number of protons


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