Chapter 4.1 Flashcards
1
Q
How did early chemists arrange the periodical table?
A
By atomic mass
2
Q
What is the rule made by John Newlands that stated that generally, every 8th element is similar?
A
Law of octaves
3
Q
Mendeleev and Meyer noticed a similar recurrence in properties. What is this called?
A
Periodicity
4
Q
Why is periodicity useful?
A
Arranged elements logically and made predicting undiscovered elements possible
5
Q
Moseley concluded that the atomic number = number of ____ = number of electrons
A
Protons; electrons
