Periodic Table Flashcards
What can element symbols be?
A single capital letter or a single capital letter followed by a lowercase letter
What language were elements historically known in?
Latin
How are chemical formulas written as?
The symbol followed by the subscript
What does Cl2 mean?
Molecule of chlorine gas contain two chlorine atoms bonded together
What is the difference between O2 and O3?
They are both made of oxygen atoms but O3 has an extra oxygen atom
What was Mendeleev searching for?
A pattern in elements that would group ones with similar properties
Why is grouping similar elements helpful?
They are likely to have similar theoretical explanations, discoveries will extend to all elements and if one is scarce it can be replaced by another in the same group
How did Mendeleev order elements?
In order of atomic weight
How are elements now ordered?
By atomic number
What was different about how Mendeleev grouped similar elements to today’s periodic table?
Mendeleev grouped similar elements in horizontal rows but the modern periodic table groups similar elements in vertical columns
Why did Mendeleev leave gaps in his version?
Because some elements had not yet been discovered and he predicted the existence of these elements based on their atomic weight and properties
Where are most non-metal elements located?
In the upper right corner in the modern periodic table
What does S8 mean?
A Sulfur element with 8 molecules in the atom
If barium sits directly below strontium in the periodic table what does that mean?
Barium is a bigger atom with similar properties to strontium
