What are the only two letters of the alphabet that don’t appear in the names of any elements on the periodic table?
J and Q don’t appear in the names of any official elements on the periodic table. However, the extended periodic table, which includes undiscovered elements, do
20
Two men walk into a bar. One man orders H2O. The other says, “I’ll have H2O too”. The second man dies. Why?
When the second man said “I’ll have H2O too”, the bartender interpreted this as “I’ll have H2O2”. This is the chemical formula for the deadly hydrogen peroxide.
25
I may have twice the life-giving gas but I do not give life to you. However, without me, you will never have food. What am I?
Carbon Dioxide.
15
Shiny like a silver, denser than lead, pricier than gold, could stop a bullet, if I wanted to. What am I?
Osmium.
15
I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each. What am I?
Water
15
I may not be gold but I make gold look more beautiful. I help you fly and even though I'm not popular, my prices run high. What am I?