The two elements a and b have same no of electrons in the penultimate and ante penultimate shells. if a and b form stable ions by the loss of 1 and 2 electrons from their fourth shell then find the atomic no of a and b?

Stage in which a typical star has completely stopped fusion

Polar bears give birth and hunt on sea ice. which of the following would polar bears survive during the melting of arctic ice? growing another layer of fur during summer migrate inland to search for different food sources staying put until the ice refreezes sticking to the usual diet of seals

What are the trends and exceptions to the trends in electron affinity?