Answer
Giving the name of the elements in each group of three
element symbols:
a) Au, At, Ag - Gold, Astatine, Silver
b) N, Na, Ni - Nitrogen, Sodium, Nickel
c) S, Si, Sn - Sulfur, Silicon, Tin
d) Ca, Cr, Cl - Calcium, Chromium, Chlorine
e) P, Pb, Pt - Phosphorus, Lead, Platinum
f) Ti, Ta, Tl - Titanium, Tantalum, Thallium
