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because they didn't react because they have stable valence shells
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoThe noble gases were not known at the time so only 17 groups could be predicted.
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How was mendeleevs periodic table like todays periodic table?
it has elements
What were mendeleevs discoveries and predictions and discoveries abot the periodic table?
Mendeleev predicted that properties of elements are periodic function of atomic mass. He demonstrated it by creating a table.
Which two elements on the periodic tabel would have been placed in different groups in moseleys periodic table but not in mendeleevs?
bi and po
Periodic table what was missing at first?
the noble gases
When Mendeleev published his periodic table there were some spaces for undiscovered elements Figure 15-1 is a section of a similar table A reasonable value for the atomic mass of the missing element?
72.3 you must be in connections academy
How was mendeleevs periodic table like todays periodic table?
it has elements
Why the improvement in Mendeleevs periodic table was made?
To understand the concept of Periodic Table
Mendeleevs periodic table of elements was created in 1901?
Mendeleev's periodic table of elements certainly wasn't created in 1901
Main idea of mendeleevs first periodic table?
In Mendeleev's periodic table, the elements were arranged in the increasing order of their atomic masses and repeating periodic properties.
What were mendeleevs discoveries and predictions and discoveries abot the periodic table?
Mendeleev predicted that properties of elements are periodic function of atomic mass. He demonstrated it by creating a table.
What changes were made to the periodic table after Dmitri mendeleevs discovery?
they changed the 3 new Elements.
Mendeleevs periodic table was useful because it enabled scientists to predict properties of unknown?
elements
Which two elements on the periodic tabel would have been placed in different groups in moseleys periodic table but not in mendeleevs?
bi and po
Who is mendeleevs?
Dmitri Mendeleev was a Russian chemist; he proposed the modern Periodic Table of elements in 1869.
In the periodic table what is a period?
A period on the periodic table is a row.This is the horizontal section of the periodic table.
What letter is missing on the periodic table?
J , and Q are missing.
What were the 3 missing elements in the periodic table?
my vasss
