chapter 5.1 Flashcards
how many elements were known in 1750’s?
17 elements
antoine lavosier
grouped known elements as metals, nonmetals, gases, and earths
dimitri mendeleev
organized known elements by playing solitaire.
what did mendeleev focus on with the elements?
how the elements reated in chemical reactions
what did mendeleev look at while organizing the elements?
chemical properties, physical properties, atomic mass, density, color, melting point, valence electrons
how are elements arranged in rows?
based on increasing mass
periodic table
arrangement of elements in columns based on a set of properties that repeat
what are the spaces in the left side for?
they are for undiscovered elements
on each solitaire card, what did medeleev list?
element name, mass, and properties
Eka is a Sanskirt word, meaning:
one
before what discovery was mendeleev’s table made?
the discovery of protons
the modern table is arranged by…
increasing atomic number
