P3 Flashcards
(13 cards)
What are periods in the periodic table?
Periods are the horizontal rows in the periodic table. All elements in a period have the same number of electron shells.
How many electron shells do elements in the first period have?
Elements in the first period have one shell for their electrons.
How many electron shells do elements in the second period have?
Elements in the second period have two shells for their electrons.
What happens to the number of electron shells as you move down the periodic table?
Every row adds another shell.
Do electron shells really exist?
No, electron shells are just useful for drawing atomic structure.
What is a more accurate way of looking at periods?
Periods can be viewed in terms of energy levels, with each period adding another energy level.
When does the rule about periods stop working?
The rule stops working after Calcium (Atomic number 20).
What are groups in the periodic table?
Groups are the vertical columns in the periodic table.
What do elements in each group have in common?
Elements in each group have the same number of electrons in the outer shell, known as valence electrons.
How many electrons do elements in group one have in their outer shell?
Elements in group one have one electron in their outer shell.
How many electrons do elements in group two have in their outer shell?
Elements in group two have two electrons in their outer shell.
What happens to the rule about outer shell electrons as you reach transition metals?
The rule starts to fall apart when you get to the transition metals.
What should you be comfortable with this year regarding the periodic table?
You should be comfortable with the first 20 elements in the periodic table, up to Calcium.
