The Periodic Table Flashcards
1
Q
How did Mendeleev arrange the elements in his periodic table?
A
By relative atomic mass
2
Q
Explain why Mendeleev left gaps in his periodic table.
A
- To keep elements with similar properties in the same group
- This would help him predict the properties of undiscovered elements
3
Q
Why did some elements not always fit the way Mendeleev arranged the periodic table?
A
- In some cases, the relative atomic mass Mendeleev had was wrong
- This was due to the presence of isotopes
4
Q
Describe what is meant by the atomic number of an element.
A
The number of protons in the nucleus of an atom
5
Q
Describe the structure of the modern periodic table.
A
- Elements are arranged in order of increasing atomic number, in rows called periods
- Elements with similar properties are placed in the same vertical columns called groups
6
Q
(Exam-style question)
A
