U3 Mendeleev Periodic Table Basics

Flashcards covering key concepts from the Honors Chemistry Unit 3 lecture on Mendeleev and the organization of the Periodic Table.

Dmitri Mendeleev (1869) organized elements by increasing ___.

atomic mass

Mendeleev grouped elements with similar properties __.

together

Mendeleev's early periodic table had some ___ in its arrangement.

discrepancies

Mendeleev also ___ properties of undiscovered elements, like eka-aluminum.

predicted

Henry Moseley (1913) organized elements by increasing __.

atomic number

Moseley's arrangement resolved ___ found in Mendeleev's periodic table.

discrepancies

Glenn Seaborg contributed to the modern periodic table by moving the Lanthanides and Actinides to the __.

bottom

John Newlands created the ___, noting a repetition of properties every eighth element.

law of octaves

Lothar Meyer demonstrated a connection between atomic mass and ___.

elements' properties

Each entry on the modern periodic table includes the Chemical Name, ___ (number of protons), Chemical Symbol, and Average Atomic Mass.

Atomic Number

Metals are typically shiny, malleable, ductile, and able to ___ electricity.

conduct

___ donate electrons to become positively charged.

Metals

Transition metals are unique because they can lose ___ numbers of electrons.

different

Non-metals are generally not shiny, can be gases at room temperature, and are __.

brittle

Non-metals ___ electrons to become negatively charged.

accept

Non-metals are typically ___, meaning they do not conduct electricity.

insulators

Metalloids exhibit ___ metal and nonmetal characteristics.

some

Lanthanides and Actinides are mostly ___ and many are __.

synthetic, radioactive

___ go across the periodic table, and their elements are ___ as to characteristics.

Periods, unrelated

Dmitri Mendeleev (1869) organized elements by increasing ___.

atomic mass

Alkalai metals

Alkaline earth metals

Halogens

Nobel gases

What are valence electrons?

Valence electrons are the electrons in the outermost shell of an atom that are involved in chemical bonding.