Quizzes, tests, exercises and puzzles for English as a Second Language (ESL), English as a foreign language (EFL), Teaching EFL (TEFL), Test of EFL (TOEFL), English for speakers of other languages (ESOL), Teaching ESOL (TESOL), TOEIC.
Element : krypton
Symbol : kr
Atomic no. : 36
Melting Point (deg c) : -157.38
Boiling Point (deg c) : -153.22
Discoverer : ramsay and travers (1898) .. More >>