Elements, Compounds and Atomic Theory

As of now, how many elements on the periodic table can be found in nature?

Which scientist developed the concept of the Nuclear Atom?

Which of the following elements is not very common in Earth's crust, oceans or atmosphere?

J. J. Thomson's research led to the identification of which subatomic particle?

Which of the following is the element symbol for Calcium?

Which subatomic particle has the largest mass?

Which subatomic particle is most important in determining the elemental identity of an atom?

Which of the following elements does NOT have a symbol that originates from Latin or Greek?

A given compound may have a different elemental composition depending on where it comes from.

Which scientist is responsible for the development of the Atomic Theory?

Which pair of subatomic particles has equal charge but in opposite directions?

Which of these postulates of the Atomic Theory are outdated in modern Chemistry?

An atom with a mass number of 73 and an atomic number of 35 has how many neutrons?