An atom X consist of 6 protons, 6 electrons and 7 neutrons. Which of the following representations of the atom is correct?

An atom X consist of 6 protons, 6 electrons and 7 neutrons. Which of the following representations of the atom is correct?

A ¹³₆X
B ¹³₇X
C ¹⁹₆X
D ¹⁹₇X

waec 2016 chemistry

The correct answer is A. ¹³₆X

No explanation given

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