question_answer 48)

  An atom with 3 protons and 4 neutrons will have a valency of (a) 3                                       (b) 7                                       (c) 1                                       (d) 4

Answer:

  (c) Given that, number of protons in an atom = 3 and number of neutrons = 4 K L Electronic configuration of As, it has one valence electron, therefore its valency is also 1.