Understanding Chemistry Quiz
What is the smallest unit of a chemical element?
- The smallest unit of an element that retains the properties of that element is an atom.
How many elements are in the periodic table?
- As of 2023, there are 118 confirmed elements in the periodic table.
What element is represented by the symbol 'O'?
- The symbol 'O' represents Oxygen.
What is the atomic number of hydrogen?
- Hydrogen's atomic number, which represents the number of protons in the nucleus of an atom, is 1.
Which element is known as the "king of chemicals"?
- Sulfur is often referred to as the "king of chemicals" because it is used in the manufacture of many products.
What is the most abundant element in the universe?
- Hydrogen is the most abundant element in the universe.
Which group of elements are known as the noble gases?
- The noble gases include helium, neon, argon, krypton, xenon and radon, and they belong to group 18 in the periodic table.
Who is considered the father of the periodic table?
- Dmitri Mendeleev is considered the father of the periodic table because he was the first to publish an organized table of elements.
What does the chemical formula H2O represent?
- H2O is the chemical formula for water, representing two hydrogen atoms bonded to one oxygen atom.
What is the heaviest naturally occurring element on earth?
- Uranium, with an atomic number of 92, is the heaviest naturally occurring element on Earth.
