In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
Did you know?
Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.
Did you know?
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
Did you know?
Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
Diagrams showing the multiple energy shells and orbitals of a nitrogen atom
The Helium Atom.
Hydrogen Atom
How to choose the right payment plan with changing conditions (Question 3)
In 1994 a team of German physicists created an atom of Element 110. If the atom
Which of the following is the electron dot formula for an atom of strontium?