Studying
Who created the first periodic table?
Dimitri 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
Most elements on the periodic table are: metals, nonmetals, or metalloids
metals
Name two physical properties of metals.
Ductile, malleable, shiny, conductive, etc.
What are alloys?
Homogeneous mixture of metals
Order the following terms from largest to smallest: orbital, energy shell, electron, subshell, atom
atom, energy shell, subshell, orbital, electron
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 because of the properties of atoms based on their number of protons
What is Ionization Energy?
Energy needed to remove an electron from the atom
When two atoms share electrons, if they are the same element, they will share ______.
evenly
What is Electronegativity?
Ability of an atom to attract electrons
What causes atomic radius to increase when heading down a group from top to bottom?
energy shells are added
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
How is atomic radius calculated?
two atoms of the same element are bonded together and the distance between their nuclei is halved
What category of elements contains many elements that are radioactive?
Actinides
Roughly how many elements can be found naturally?
90
What causes ionization energy to go up from left to right in a period?
Why do we study periodic trends?
Because the trends indicate the properties of the elements and how they can be used