Atomic number

The video explains the concept of atomic numbers, which determine the chemical element of an atom. It highlights that elements with atomic numbers 1 to 92 occur naturally, while those with higher numbers have been artificially created since 1940. Currently, around 118 elements have been observed.

What does an atom determine in chemistry?

• The chemical element it belongs to

• The color of a substance

• The temperature of a reaction

• The speed of a chemical process

Up to which atomic number do elements naturally occur in significant amounts?

• 92

• 75

• 50

• 118

Since when have elements with atomic numbers higher than 92 been artificially created?

• Since 1980

• Since 2000

• Since 1940

• Since 1900

How many elements have been observed so far?

• 92

• 100

• 118

• 150

What is the significance of atomic numbers in elements?

• They indicate the element's color

• They show the element's melting point

• They determine the element's weight

• They define the element's chemical properties