For chlorine, Z = 17, A = 35. Give the number of protons, electrons and neutrons in
(i) chlorine atom (ii) chloride ion.
In chlorine atom (Cl),
Number of protons (Z) = 17
Number of neutrons = A — Z = 35 — 17 = 18
(i) In chlorine atom ():
Number of protons (Z) = 17 (Atomic number)
Number of electrons = 17.
Number of neutrons = A-Z = 35-17 = 18
(ii) In chloride ion ():
Number of protons (Z = 17) (Atomic number)
Number of electrons = (Z+I) = 17+1 = 18 (Formed by gaining one electrons)
Number of neutrons = A-Z = 35-17 = 18