Question : Which element precedes carbon in the modern periodic table?

Question : What is the chemical name of table salt?

Question : Which chemical element from group 18 of the modern periodic table, whose atomic number is 10, contains a mixture of three stable isotopes commonly used to make signal and gas lasers and as refrigerators?

Question : Name the metal ion used in the Veri-Green process.

Question : Which of the following elements is the densest naturally occurring element?