Flashcards in Chapter 5-6 Deck (73):
was the first to discover some elements had similar properties (early 1800's) --
he also figured if you average mass of 3 elements, is the mass of the middle element -
he organized elements in order of increasing mass -
he noticed that properties of the elements seem to repeat every 8 elements
1-7 elements =
8th element =
property like element 1
9th element =
property like element 2
repeating patterns ..
he wroter properties of each elements on cards & then arranged them in various ways =
he organized the 1st periodic table =
he worked under Rutherford
he used x-rays to assign each element a whole #, called the atomic # =
he organized elements by atomic #, not mass # =
how many elements are there?
elements w/ similar properties
arranged in columns
numbered 1-18, starting at the left
elements in a row
numbered by energy levels, starting at the top
as the number ___________, so does the number of ___________ in the period.
why was the f-block taken out and put in the bottom =
because it was to hard
they're silver-gray, except copper & gold
they're also called semimetals =
they have high melting points -
they don't reflect light =
they DO reflect light when polished -
they are poor conductors of heat and electricity -
they can be bent / hammered flat -
they are good conducters of heat and electricity -
they are properties of metals and nonmetals
"silicon valley" =
materials that engineers work w/
brittle, low melting points -
they are mostly solid or gas at room temperature, except Br = liquid
they are the electrons in the highest energy level of an atom =
they are the only electrons that can bond w/ another element to make compounds -
to find the # of valence electrons, always used the _________ ________ of the group number.
the # of valence electrons varies for what blocks?
the d & f blocks
its when elements are arranged in order of increasing atomic number, their physcial and chemical properties show a periodic (repeating) pattern -
systematic means ...
systematic and predictable variation in a physcial or chemical property of each element as you move throught the periodic table =
all atoms on the same energy level -
left to right (electrons get pulled in) -
it ____________ from left to right. -
why does it decrease from left to right -
as you move to the right, each atom adds a proton & electron
they pull on all electrons -
the more _______, the more the electrons get _______ on.
the more the protons _____, the closer the electrons are too the _________
the elctron w/ a lot of energy & is close=
harder to take away
electrons w/ less energy & NOT close =
easy to take away
the elctron w/ a lot of energy & is close
electrons w/ less energy & NOT close
^^ what is this called =
small radius = close electrons = harder to take away =
large radius = far electrons = easy to take away =
how much an atom wants to take an electron away from another atom =
low electronegativity =
DOESNT want to take electron away
high electronegativity =
DOES want to take electron away
high ionization energy = high elctronegativity which =
low ionization energy = low electronegativity which =
bigger atoms - electrons farther from nucleus =
all elements in a single group share .....
the properties of metalloids are ...
they are halfway between metals and non-metals
the elements are arranged in order of increasing atomi c #; it shows a repeating pattern -
how much an atom wants to take away electrons from another -
amount of energy it takes to remove an electron from an atom =
when moving left to right the ......
atomic radius decreases
what are the elements on the bottom of the periodic table called -
rare earth metals
distance between the nucleus of an atom to the outtermost part
whats another name for group 2 -
alicine earth metals
groups 18 also knows as ...
group 1 also known as ....
what is the d block also known as ...
group 1 also known as ...
group 17 also known as ...
where are metalloids?
the ziggy line on periodic table
where are metals?
all the elements to the LEFT of the metalloids/ziggy line