Atoms And The Periodic Table Flashcards
What is an atom
The smallest part of an element that can still be recognised as that element
What is an element
A substance made of only one type of atom
What is a compound
A substance made of two or more different types of atoms chemically bonded together
What is a mixture?
A substance made of more than one thing not chemically bonded together
What are groups in the periodic table
The vertical columns
What can the group tell you about the electrons in an atom
How many electrons in the outer shell
What are periods in the periodic table
The horizontal rows
What can the period tell you about the electrons in an atom
How many shells an atom has
Why did Mendeleev put some elements in groups?
Because they had similar properties
Why did Mendeleev leave gaps in his periodic table
For elements that had not been discovered yet
