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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).
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∙ 14y ago
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∙ 11y agoMendeleev predicted the discovery of other elements and left space for these new elements, namely eka-silicon (germanium), eka-aluminium (gallium), and eka-boron (scandium).
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∙ 9y agoMendeleev left out the Noble gases (group 18) because they are virtually imperceptible due to the fact that they won't react with any other elements.
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∙ 11y agoWiki User
∙ 9y agoThorium,Uranium and protactinium are the three missing elements.
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∙ 15y agoGroup 0 elements, the noble gases.
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∙ 11y agogermanium, gallium and scandium
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∙ 6y agoThe Noble gases.
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Which group on the periodic table was the last to be discovered, it was missing from the Mendeleev's periodic table. *
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Is sulfuric acid on the periodic table?
No, the periodic table only lists elements. Sulfuric acid (H2SO4) is a compound of three elements: hydrogen, sulfur, and oxygen.
What are the three elements that can be classified based on their properties?
Elements are classified as set out in the Periodic Table of the elements. It is NOT clear to what "three" you are referring.
What are the three main types of elements on the periodic table?
Metals nonmetals and metalliods
Why did Mendeleev leave blanks in his early version of the periodic table?
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.
What makes up carbon hydrogen and oxygen?
ALL three are elements belonging to Periodic table.
What are the three lightest elements in the periodic table?
HydrogenHeliumLithium
What are the three main classes of elements in a periodic table?
Three main classes are:MetalsNon metalsTransition elementsThey are present in periodic table.
Why did Mendeleev leave three spaces on the periodic table?
Because those elements were not known when he formulated his periodic table.
Are more than three-fourths of the elements in the periodic table non-metals?
No it is the other way around. The majority of elements in the periodic table are metals.
Is sulfuric acid on the periodic table?
No, the periodic table only lists elements. Sulfuric acid (H2SO4) is a compound of three elements: hydrogen, sulfur, and oxygen.
What are the three elements that can be classified based on their properties?
Elements are classified as set out in the Periodic Table of the elements. It is NOT clear to what "three" you are referring.
What are the names of three metalliods from the periodic table of the elements?
Si, As and Te
Are the three main classes of elements in the periodic table?
metalsnon metalssemi metals
What are the three main types of elements on the periodic table?
Metals nonmetals and metalliods
What elements has three energy levels?
On a periodic table, Sodium onwards (Na)
What family on the periodic table does glucose belong to?
Only individual elements have a place on the periodic table, but glucose is composed of three different elements: carbon, hydrogen, and oxygen, so it doesn't belong anywhere on the table.
What are three types of categories found in the periodic table?
The three main categories of elements on the periodic table are metals, metalloids, and nonmetals.
