What is Dry Ice?

A. Solid Oxygen
B. Solid Carbon Dioxide
C. Solid Hydrogen
D. Solid Nitrogen

1 light year = ?

A. 9.5×106 km

B. 9.5×109 km

C. 9.5×1012 km

D. 9.5×1018 km

Deuterium differs from Hydrogen in having:

A. Different atomic number but same atomic weight

B. Different atomic number and different atomic weight

C. Same atomic number and different atomic weight

D. None