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☆☆☆☆☆Cards in this guide (8)
Where are the noble gases located on the periodic table
The far right column.
What is a lanthanide element
A lanthanide element is any element that resides in the Lanthanide series on the Periodic Table. The Lanthanide series is just under the Actinide series on the Periodic Table and is usually seperated from the main part of the Periodic Table. All of the Lanthanide elements are radioactive.
How many elements were there in 1860
63 elements had been discovered so far.
How did Thomson help our understanding of the atom
He discovered that the atom contained smaller particles called electrons.
How is hydrogen in heavy water different from hydrogen in normal water
Type your answer here... The hydrogen atoms in heavy water have a neutron in the nucleus, doubling the mass.
What did John Dalton publish
An early theory describing properties of atoms
Which of the following is a noble gas
Argon (Ar) is one of them
Na-23 has 12 neutrons what is its atomic number
11
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