Q4. Give the systematic names and symbols of elements 130 and 150.
130: un, tri, nil, so untrinilium, Utn. 150: un, pent, nil, so unpentnilium, Upn.
Q5. Name elements 190 and 199, taking care with the spelling rule for “enn”.
190: un + enn + nil + ium; “enn” before “nil” drops one n, giving unennilium, Uen. 199: un + enn + enn + ium = unennennium, Uee.
Q6. Why did IUPAC introduce systematic names for new elements?
Superheavy elements are made only a few atoms at a time in a handful of competing laboratories, and discoveries have sometimes been claimed before the data were reliable. Rival teams then proposed different names (rutherfordium and kurchatovium for element 104). A temporary name based only on the atomic number avoids such disputes until the discovery is confirmed and IUPAC approves a permanent name.
Q7. An element has the temporary symbol Une. What is its atomic number and its official name?
U, n, e: un, nil, enn, so 1, 0, 9: element 109, unnilennium, now meitnerium (Mt).