How many principal electronic shells has an atom whose electronic configuration is shown below? 1s22s22p63s1

Which of the processes represented by the following equations has the greatest positive entropy change?

When air is passed through a heated tube containing finely divided copper, the component that is absorbed in the process is

The metal extracted from cassiterite is

What is the amount (in mole) of sodium trioxocarbonate (IV) in 5.3 g of the compound? (Na2CO3 = 106)

Which of the following elements can from more than one acidic oxide?

In which of the following is the oxidation number of nitrogen zero?

The separation of a mixture of calcium trioxocarbonate (lV) and sodium trioxocarbonate (IV) is most easily carried out by using the differences in their

CH2 = CH2 + H2SO4 → CH3 - CH2 -OSO3H. The reaction illustrated by the equation above is an example of