In 1870, 63 elements had been discovered.
97 elements were known in 1950. Berkelium (Element 97) was discovered in December 1949.
117 Elements have been discovered.One more element has now been discovered bringing the total number now to 118 elements
Helium as an element has been around since fusion began in stars, but it was discovered in 1868
Lead was commonly used in paints until harmful side effects, such as lead poisoning, were discovered. Lead poisoning can cause serious health issues, especially in young children and pregnant women. As a result, lead has been banned from use in paints in many countries.
Over 118 elements have been discovered and confirmed on the periodic table.
78
An element is a substance in which every atom is the same. There are 118, 112 of which have been discovered.
97 elements were known in 1950. Berkelium (Element 97) was discovered in December 1949.
49
From 1870 to 2011 there have been 34 leap years.
how many Mayan codices have been discovered
The Element, Phosphorus (symbol P) was isolated/discovered in Germany by Brandt in 1669.German Alchemists had been experimenting with various urine samples for many years but, Brandt is credited with the 'discovery.'
No one knows exactly when mercury was discovered, but many ancient civilizations were familiar with this element. It's ore is a dark red and known a cinnabar. When heated in a charcoal fire droplets of the metal appear on it's surface.
Three: nonmetals, semimetals (or metalloids), and metals.
Any element was discovered in 1985.
Helium. It was discovered on the Sun many years before it was discovered on Earth.
The ruins of seven cities have been discovered in Delhi.