See "Mendeleev's predicted elements" in Wikipedia The answers are: scandium (Sc - 21), gallium (Ga - 31), technetium (Tc - 43), and germanium (Ge - 32) He temporarily named them to be: ekaboron (Eb), ekaaluminium (El), ekamanganese (Em), and ekasilicon (Es).
No, the periodic table only lists elements. Sulfuric acid (H2SO4) is a compound of three elements: hydrogen, sulfur, and oxygen.
There are 2 elements in the first period, 8, 8 elements in 2nd and 3rd periods respectively,
At the time the periodic table was first devised, there were many elements that had not yet been discovered. Their existence could be inferred, but they couldn't actually be put into the table until they were discovered.When the periodic table was first devised, there were lots of elements that had not been discovered yet.
NOT as 'diamond'. However, diamond is an allotrope of carbon . Carbon is found in the periodic table. as 'C'. NB Diamond, Graphite and Buckminster Fullerene (Footballene) are three allotrop[es of of Carbom . NOT isotopes. An Allotrope is an element that exists in different physical form.
The three families that are found in the center portion of the periodic table are the Iron group, the Cobalt group and the nickel group. There are 18 families in the periodic table.
The missing elements that Mendeleev predicted in his periodic table were germanium, gallium, and scandium. Mendeleev left gaps in the table for these elements based on the patterns he observed in the known elements at the time.
HydrogenHeliumLithium
Three main classes are:MetalsNon metalsTransition elementsThey are present in periodic table.
Because those elements were not known when he formulated his periodic table.
No it is the other way around. The majority of elements in the periodic table are metals.
Si, As and Te
No, more than three-fourths of the elements are metals. Love, Grahamcracker
No, the periodic table only lists elements. Sulfuric acid (H2SO4) is a compound of three elements: hydrogen, sulfur, and oxygen.
metalsnon metalssemi metals
The three main categories of elements on the periodic table are metals, metalloids, and nonmetals.
The three broad classes of elements found the periodic table are metals, non metals, and metalloids.
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