Development of the Periodic Table Flashcards
1
Q
What order did Newlands arrange the elements in?
A
Mass
2
Q
How did Dmitri Mendeleev put the elements in his periodic table?
A
Their atomic mass
3
Q
What did Newlands discover in his periodic table?
A
He noticed that every 8th element seemed similar
4
Q
What is an example of an anomaly is Mendeleev’s periodic table?
A
Argon (noble gas) being in the same group as potassium (highly reactive)
5
Q
What order were elements sorted in at the start of the 20th century?
A
Number of protons (atomic number)
