notes episode 401

Dmitri mendeleev
.arranged elements by increasing atomic mass
.predicted properties of missing elements
Henry Moseley
.discovered that each element has a unique atomic number
.arranged elements by atomic mass number
.now all elements fit into place based on properties
Modern periodic law
properties of elements repeat when elements are arranged by increasing atomic number
what happens to the number of the energy level as you begin each new row?
increases by 1
what is the similar characteristic in each column?
same number of valence electrons
elements in the same column have similar ________?
electron distribution
elements in the same column have the same number of ___________?
valence electrons
elements in the same column have similar ________ properties?
chemical
Noble gases have _______ outer ________?
full outer energy level
Noble gases have how many valence electrons?
8
noble gases are _______?
stable
periods?
families?
1.rows on periodic table
2.columns on the periodic table
periods tell what?
energy level
in columns 1-2 and 13-18 the number in the ones place tells what?
number of valence electrons
metalloids have properties of ______ and _____?
metals and nonmetals
metalloids border ________? except Al which is a _____?
the zigzag line
metal
x

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