The most abundant element in the universe is element A. This is gas at room temperature and acts as metal when in solid state. It is also a promising source of "clean" fuel on Earth. Moreover, it is the only element that can exist without neutrons.
1. Element A is _______
a. Gold
b. Mercury
c. Calcium
d. Hydrogen
2. How many protons does A has?
a. 1
b. 2
c. 3
d. 5
3. The name of the last element in the group beside element 's A group is _____.
a. Francium
b. Radium
c. Rutherfordium
d. Dubnium
4. How is element A denoted?
a. N
b. Sc
c. H
d. Ti
5. A swig of element A's oxide promoted by alternative-health devotees can kill people . Name the oxide.
a. Nitric oxide
b. Hydrogen peroxide
