chemistry chapter 6 (Maquar)
What mistakes did Mosely correct from Mendeleev's table?
-Cobalt and Nickel were in opposite positions -Argon and Potassium (property differences) -Tellurium and Iodine
What did Mendeleev do?
-He demonstrated a connection between atomic mass and elemental properties
The first and the eighth elements have what in common?
-They have similar properties
metal property
-most are malleable and ductile
Metal property
-solid at room temperature
how are metals designated in the periodic table?
-they are left of the zig zag line
which period contains the least number of elements?
1
how many elements are in the periodic table?
118
How many columns of elements does the periodic table contain?
18
what two group numbers can be used to designate elements in the second column?
2A,2
In what period does the first d-sublevel appear
4
What period does the first f-energy sublevel appear
6
how many rows of elements does the periodic table contain?
7
What is the name of the group 1A elements?
Alkali metals
Why is hydrogen not considered a metal?
Because it is a gas.
What do elements in the s- block all have in common?
Each of the valence electrons are in the same s
what is the name of the group 7A elements?
Halogens
How did Mosely organize tis periodic table?
He arranged the elements in increasing atomic number
How Mendeleev organize the periodic table?
He left blank spaces where he thought the undiscovered elements should go?
What did Mendeleev organize?
He organized the first periodic table
Why does the s-block just span two groups of elements?
It can only hold 2 electrons (only 1 orientation)
How is the Modern Periodic Table organized?
It is arranged in increasing atomic number order
What is the name of the group 8A?
Noble Gas
D&F blocks are called what?
The inner transition elements?
Why does the p-block have six groups?
The p-block has 3 orientation (2 in each), so there can be a total of 6
What can be said about the electron configurations of all the elements in a group?
They all have the same number of valence electrons
Why are they called representative elements?
They have a wide range of chemical and physical properties.
Why do atoms in the same group have similar chemical properties?
They have the same number of valence electrons
What does each block represent?
a sublevel
What is the name of the group 2A elements?
alkaline earth metals
What is the ending of the electron configuration of each element in group 3B?
d1
non-metal property
dull-looking solids
Valence Electrons
electrons in the highest principal energy level of an atom
Metalloids
elements with physical and chemical properties of both metals and non-metals and located along the zig zag line on the periodic table
Non-metal property
generally gases or brittle
metal property
good conductor of heat and electricity
what is another name for a column of elements?
group
columns are also called?
groups or families
halogens
highly reactive group
What is the ending configuration of each element in group 4A?
p2
what is another name for a row of elements?
period
rows are also called?
periods
non-metal property
poor conductor of heat and electricity (used as insulators)
1A through 8A (s&p blocks) are called what?
representative elements
What are the four sections, or blocks of the periodic table?
s,p,d,f
the energy level of an element's valence electrons indicate what?
the Period on the periodic table in which it is found.
Groups designated "B" refer to what?
the translation elements
what happens to the elements when they are arranged in increasing order of atomic mass?
their properties are repeated every 8th elements?
Periodic Law
there is a periodic repetition of chemical and physical properties of the elements when they are arranged in increasing atomic number.
