Which of the following ins not an actionid? (a) Curium (Z= 96) (b) Californium (Z= 98) (c) Uranium (Z = 92) (d) Terbium (Z = 65)
Elements with atomic number Z = 90 to 103 are called actinoids. Thus, terbium (Z = 65) is not an actinoid. Terbium belong to lanthanoids.
If z is a complex number such that −π2≤ arg z ≤π2, then which of the following inequality is true