The colour of phenolphthalein indicator in alkaline solution at the end-point of an acid-base titration is?

Which of the following ions has the electron configuration 2,8,8?

The energy change that accompanies the addition of an electron to an isolated gaseous atom is

Which of the following elements would produce coloured ions in aqueous solution?

An element with the electron configuration of 1s 22s 22p 6 would have a combining power of

Which of the following electrons configurations correctly represents an inert element?

How many isotopes has hydrogen?

Rare gases are stable because they

What type of reaction is represented by the following equation?\(\frac{2}{1}\)D\(\frac{3}{1}\)H → \(\frac{4}{4}\)He + \(\frac{1}{0}\)n + energy