The Periodic Table Flashcards
About how many naturally occurring elements are there?
100
Who designed the first design of the periodic table
Mendeleev
What about Mendeleev’s design made it good?
It was testable and predicted undiscovered elements
How were elements placed in the periodic table?
Based on their atomic mass
What was a drawback of Mendeleev’s periodic table?
Some elements were put in a the wrong place as their atomic masses were incorrect
What is the modern periodic table in comparison to Mendeleev’s?
A modified version
What does the periodic table take into account?
Arrangement of electrons
Atomic number
Is a group a column or a row?
A column
What do elements in the same group have?
Similar chemical properties because they have the same number of electrons in their outer shells
How many electrons are in the outer shell of an element in Group 0?
8
Is a period a column or a row?
A row
What does the period of an element show?
The number of occupied electron shells
What are elements on the left side of the diagonal line?
Metals
What are elements on the right side of the diagonal line?
Non-metals
Give 7 properties of metals
Lustrous Hard High density High tensile strength High melting and boiling points Good conductors of heat Good conductors of electricity
