Easy
Anions are always ______ than the atoms from which they form
Larger
There were only __ elements identified by 1700
13
The periodic table usually displays the _____ and ______ of the elements.
symbols, names
Atomic ____ decreases from left to right across a period
size
ability of an atom in a compound to attract electrons
electronegativity
Nonmetals tend to form ______
Anions
Metals make up ____ of the periodic table
80%
Atomic number is _____ the symbol
above
an ion is an atom or group of atoms that has a ______ or _____ charge
positive, negative
What are the two least electronegative elements
cesium, francium
For each successive electron that is removed, it takes _____ energy.
More
The arrangement of the electrons around the nucleus explains the patterns we see.
Periodicity
Group 1a _____ metals
alkali
Cations lose a _____ to form a positive charge
electron
which group does the most electronegative element sit on top of
17 or 7a
First ionization energy tends to ______ from top to bottom within a group
decrease
IUPAC
International Union of Pure and Applied Chemistry
Transition elements are labeled as what block
D
_______ tend to form cations
Metals
Group 7A gains how many electrons
1
Dimitri arranged the elements in his periodic table in order of increasing _______ _______
atomic mass
Poor conductors of heat and electric current
Nonmetals
How many picometers are in a meter
trillion
amount of energy required to remove an electron from an atom
Ionization energy
With each electron removed, it takes more energy as the more positive nucleus has a _____ pull on the remain electrons
stronger
Cations are ______ than a neutral atom
smaller
which element is the most electronegative
fluorine
in 1829 Dobereiner published a classification system, In his system the know elements were grouped into _____
triads
In 1869 Dimitri publised a table of _____ elements
60
He didnt know that the atoms of each element contain a unique number of ______
protons