Which of the following elements exhibit great stability and extremely low reaction rates?
a) the alkali metals
b) the alkaline earth metals
c) the halogens
d) the noble gases
Airships are filled with……., since it is very light and unreactive.
a) helium
b)sodium
c) argon
d) neon
Which of the following gives out light when high voltage electricity is passed through it?
a) helium
b) sodium
c) argon
d) neon
Which one of the following is used in advertising signs?
a) helium
b) sodium
c) argon
d)neon
What is the atomic no. of Lithium and how many electrons does it have?
a) 3
b) 11
c) 19
d) 4
What is the atomic no. of Sodium and how many electrons does it have?
a) 3
b) 11
c) 19
d) 4
