Approx. 20 elements were known in 1800.
36 elements were known in 1800.
As 1800, exactly as it appears in the question.
In 1818 there were 49 known and accepted (by the scientific community) elements.
i nee your 1800 number to pay a bill
Periodic Table of Elements.
From what i know it is 109, Meitnerium.
Periodic Table of Elements.
Uranium and hydrogen
no
Helium, neon, argon, krypton, and xenon were all discovered after 1800. These noble gases were first isolated from air and had distinct properties that led to their identification as new elements.
The number in between 180 and 1800 can be found by calculating the average of the two numbers. This is done by adding them together and dividing by 2: (180 + 1800) / 2 = 990. Therefore, 990 is the number that lies exactly between 180 and 1800.
you see how many electrons and protons it has and add them together