Question

An element x has 17 protons and 17 electrons and 18 neurons
a. what is mass number of x
b. what is atomic number of x
c. what is valency of x
d. identify element

Answer 1

a.) Mass Number = protons + neutrons
                               = 17 + 18
                               = 35

b.) Atomic no = No of protons or electrons
                        = 17

c.) Valency = 1-

d.) Identify element = Chlorine (Cl)

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