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Why does helium and hydrogen does not come in agroup of periodic table?
Wiki User
∙ 9y ago
Helium has 2 valence electrons and hydrogen has 1 electron. So, they are placed in different groups.
Wiki User
∙ 9y ago
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What were the first elements that were found in the periodic table?
The first elements in the periodic table are hydrogen, helium, lithium, beryllium, boron.
The first element on the periodic table table of elements is helium?
No, the first element on the Periodic Table is Hydrogen, but because of its unusual behaviour it is usually placed by itself, not next to any other elements. The second element is Helium.
What is the element in the first row of the periodic table that is not a alkali metal?
hydrogen (and helium)
How many groups and how many periods does the modern periodic table have hydrogen and helium should be counted as the first period.?
The periodic table has 18 groups ant 7 periods. Hydrogen and helium are considered members of the first period.
Name all of the elements on the periodic table. I dare someone.?
hydrogen and helium and berylium and lithuim and...
Does h stand for helium on the periodic table?
No, the symbol "H" stands for Hydrogen on the periodic table. The symbol "He" stands for Helium on the periodic table.
Can you name the primary elements of nature?
Hydrogen, helium, lithium... See a periodic table for the full list.Hydrogen, helium, lithium... See a periodic table for the full list.Hydrogen, helium, lithium... See a periodic table for the full list.Hydrogen, helium, lithium... See a periodic table for the full list.
What were the first elements that were found in the periodic table?
The first elements in the periodic table are hydrogen, helium, lithium, beryllium, boron.
Why hydrogen and helium are out of periodic table?
Hydrogen and helium aren't 'out' of the periodic table, hydrogen just has characteristics that match up with group one (very reactive) and helium has characteristics that match up with group 8 (non reactive).
What is the atomic sign for helium on the periodic table?
He is the symbol for helium
What does the letter H stand for in the periodic table?
"H" stands for Hydrogen on the periodic table.
What are 2 compounds in group 1 of the periodic table?
helium and hydrogen
Is helium Hydrogen?
who are you have you ever looked at the periodic table of elements? Hydrogen is the lightest element while helium is the second lightest element. No.
The first element on the periodic table table of elements is helium?
No, the first element on the Periodic Table is Hydrogen, but because of its unusual behaviour it is usually placed by itself, not next to any other elements. The second element is Helium.
What two elements are found in the first row of the periodic table?
Hydrogen and Helium
Helium is the first element on the periodic table?
No. It is hydrogen. Refer to the related link.
What are periods on an periodic table?
hydrogen, helium, lithium, berylium, boron, carbon
