Número atómico

The video tutorial explains that atoms define chemical elements. Naturally occurring elements have atomic numbers between 1 and 92. Since 1940, elements with higher atomic numbers have been artificially created, leading to the observation of 118 elements in total.

What defines the chemical element of an atom?

• The number of electrons

• The number of protons

• The atomic mass

• The number of neutrons

Which range of atomic numbers is naturally found in significant quantities?

• 1 to 50

• 1 to 92

• 1 to 100

• 1 to 118

Since when have atoms with higher atomic numbers been artificially created?

• Since 1940

• Since 1980

• Since 1960

• Since 1920

What is the significance of the year 1940 in the context of atomic numbers?

• Start of artificial creation of elements

• Discovery of the first element

• Introduction of atomic theory

• End of natural element discovery

How many elements have been observed so far?

• 120

• 118

• 92

• 100