How many isotopes have odd atomic number ?

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The volume occupied by 2.8 g of N2 at STP______________________?

A. 2.24 dm3 B. 22.4 dm3 C. 1.12 dm3 D. 112 dm3...

Which of the following terms is used for the mass of chlorine 35.5 ?

A. relative atomic mass B. mass number C. atomic weight D. relative isotopic mass...

Which statement is consistent with Hunds rule ?

A. Electrons fill orbitals with parallel spins until all the orbitals of the same energy are half filled then they go into sub-shells with anti-parallel (opposite) spin. B. The electrons in the same atom cannot have the same four quantum numbers C. There is maximum of two electrons is an orbital. D. None...

Which of the following is mineral fiber ?

A. Teflon B. asbestos C. saran D. acrylic...

Fruit juices and fizzy drinks such as lemonade are often sold in aluminium cans. What is the most important reason aluminium is a suitable metal ?

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