Periodic Table Design
Mendeleev's periodic table was originally organized by increasing?
Atomic Mass
___________ is a recurring pattern
Periodicity
_________ have a positive charge because they have given away an electron
Cations
The pattern for atomic radius across a period? (increase or decrease) and atomic radius down a group? (increase or decrease)
Decrease, Increase
Group 1
Alkali Metals and 1
A new group was added to Mendeleev's table after the discovery of?
Noble Gases
__________ ____________ is an arrangement of the elements in order of their atomic numbers so that elements with similar properties fall in the same group.
Periodic Table
________ have a negative charge because they have accepted an electron
Describe the pattern for electronegativity across the periodic table? (increase or decrease) Describe the pattern for electronegativity down a group? (increase or decrease)
Increases and Decreases
Group 2
Alkali Earth Metals and 2
Atomic Number
______ ______ is defined as one half the distance between the nuclei of identical atoms.
Atomic Radius
__________ _________ is the energy required to remove an electron from an atom
Ionization Energy
Consider the elements F, Ne, and O. Which will have the smallest atomic radius?
Ne
Group 14
Carbon and 4
Who discovered that the elements fit into patterns better when organized by atomic number?
Henry Moseley
An ______ is an atom or group of bonded atoms that has a negative or positive charge.
Ion
The electrons in the outermost occupied energy level are referred to as?
Valence Electrons
Consider the elements Se, S, and Te. Which will have the smallest atomic radius?
S
Group 16
Oxygen and 6
What 4 things did Mendeleev write on each note card when organizing the elements?
Name, Atomic Mass, Physical Properties, Chemical Properties
_____ _______ States that all atoms want to have 8 electrons in their outermost occupied electron level.
Octet Rule
In 1898, who discovered the 2 noble gases Krypton and Xenon?
William Ramsay
Consider the elements K, Rb, Sr, and Cs. Which will be the most reactive with H20?
Cs
Group 17
Halogens and 7