Question Topics: Structure 3.1 The periodic table: Classification of elements

Which statement correctly explains the violet colour of the complex ion \( [Cu(NH_3)_4(H_2O)_2]^{2+} \) formed when copper(II) sulfate reacts with

Which of these elements is in the f-block of the periodic table?

Which pair of elements would react with each other the least vigorously?

Which part of the periodic table contains elements which are likely to form acidic oxides only?

Which properties are typical of transition elements? I. Low melting points II. Formation of coloured compounds III. Variable oxidation states

Why do group 17 elements have higher first ionization energies than group 1 elements in the same period?

What is the group number of the element whose successive ionization energies are shown in a graph where the first

Which elements would react with each other most vigorously?

Which statement explains why transition elements have variable oxidation states?