Mrs. Padovani
Who created the first periodic table?
Mendeleev
What are columns called on the periodic table?
Groups or families
What are rows on the periodic table called?
periods
What are valence electrons?
Outermost electrons of an atom
What are most elements on the periodic table?
metals
Name two physical properties of metals?
Ductile, malleable, shiny, etc.
What are alloys?
Homogeneous mixture of metals
Where can you find the rare earth metals?
F block
What is the name of the most reactive metals?
Alkali Metals
Which group is slightly less reactive than Alkali metals but still highly reactive?
Alkaline earth metals
What are the most reactive nonmetals?
Halogens
What is the most common element in the universe?
Hydrogen
Why Do periodic Trends exist?
Periodic trends exist since properties of elements exist
What is Ionization Energy?
Energy needed to remove an electron from the atom
What is Atomic Radius?
Half the distance between two bonded atom’s nuclei
What is Electronegativity?
Ability of an atom to attract electrons in a bond
What causes the trends?
Effective nuclear charge
Does atomic radius increase or decrease going across?
Decreases
Does electronegativity increase or decrease going down?
Decreases
Does Ionization energy increase or decrease going down?
Decreases
What is the Big Bang theory?
elements were created when the universe was formed in a massive ‘explosion’.
What are supernovas?
Large Stars collapse and blow
How many elements are found in nature?
93
What is Transmutations?
a type of nuclear reactions that change one element into another element
Are Matt and Autumn getting an A on this?
Yes.