Chem Quest Periodic Table
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22 Terms
Which scientist is credited with the current arrangement of the elements of the periodic table of elements?
Dimitri Mendeleev
How did Dimitri Arrange the elements in his periodic table. How did he come up with this arrangement?
He arranged the elements in order of increasing atomic mass. He placed them in a rose and then made columns based on their similar properties elements exhibited.
What happens to valence electrons as they move across each row?
They increase
What happens to valence electrons as they move down each column?
They stay the same
What happens to energy levels/shielding as they move across each row?
They stay the same
What happens to energy levels/shielding as they move down each column?
They increase
What happens to atomic radius as they move across each row?
It decreases
What happens to atomic radius as they move down each column?
It increases
What happens to ionization energy as they move across each row?
It increases
What happens to ionization energy as they move down each column?
It decreases
What happens to electronegativity as they move across each row?
It increases
What happens to electronegativity as they move down each column?
It decreases
Atomic radius
1/2 the distance between the nuclei and identical atoms of the same element
Ionization energy
Amount of energy required to remove an electron from an atom
Electronegativity
A measure of the ability of an atom in a chemical compound to attract electrons from another atom
Which two elements are liquids at room temperature
Browning and mercury Br and Hg
Three transition metals that are used in making jewelry
Gold, silver, and platinum Au, Ag, Pt
Diatomic element
Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
What happens to reactivity in metals as they go down a group?
Increases and lose electrons
What happens to reactivity in metals as they go across left to right a period?
Decreases
What happens to reactivity in nonmetals as they go across left to right a period?
Increases
What happens to reactivity in nonmetals as they go down a group?
Decreases