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Chapter 6

Chapter 6, The Periodic Table: vocab and key ideas

How did early chemists sort elements into groups? they used the properties of the elemnts to sort them into groups.
How did Mendeleev arrangethe elements in his periodic table? in order of increasing atomic mass.
In the modern periodic table, how are the elements arranged? in order of increasing atomic number
What is the periodic law? when elements are arranged in order of increasing atomic number, there is a periodic repetition of their phsical and chemical properties.
What are the three classes of elements? metals, nonmetals, and metalloids
Across a period, the properties of elements become what? less matalic and more nonmatalic
About 80% of the elements on the periodic table are what? metals
Metals are usually good _____ of heat, and ____ currents. conductors, electrical
All metals are solids at room temperature except which one? mercury
In general, nonmetals are ___ conductors of heat and electrical currents. poor
Solid nonmentals are what? britle
What are alkali metals? the elements in group 1A
What are the elements in group 2A? alkaline earth metals
What are the nonmetals of group 7A called? halogens
The periodic table usually displays what? the symbols and names of the elements, along with information about the structure of their atoms.
How can elements be classified based on electron configuration? Elements can be sorted ito noble gases, represntative elements, transition metals, or inner transition metals based on their electron configurations.
What are examples of noble gases? helium, neon, and argon
Elements in what groups are often identifies as representative elements? 1A through 7A
Transition metals are the group __ elements and are usually displayed in the main body of the periodic table. B
What are the elements that appear below the main body of the periodic table? inner transition metals
The atomic radius is one half the distance between the ___ of two atoms of the same element when the atoms are joined. atomic radius
What is a ion? an ion is an atom or group of atoms that has a positive or negative charge.
What is an ion with a positive charge called? a cation
An ion with a negative charge is called what? a anion
The energy required to remove an alectron from an atom is called what? ionization energy
Ionic size tends to ____ from top to bottom within a group. increase
Define electronegativity: the ability of an atom of an element to attract electrons when the atom is in a compound.
In general, electronegativity values _____ from top to bottom within a group. decrease
What are the four blocks? s block, p block, d block, f block
How can positive and negative ions form? when electrons are transfered between atoms.
When is ionization energy measured? when an element is in it's gaseous state.
Created by: jmhschemistry