7.1 Flashcards
1
Q
What do all elements in a period have?
A
They have the same number of electron shells, meaning there is repeating trends in physical and chemical properties
2
Q
What do all elements in groups have in common?
A
They have similar outer shell electron configurations so they have similar chemical and physical properties
3
Q
Why did Mendleev leave gaps in his periodic table?
A
For undiscovered elements
4
Q
What do elements in the periodic table increase by?
A
Increasing atomic/proton number
