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Atom, Periodic table
from lecture notes, for our stinkin quiz
42
Chemistry
Undergraduate 1
02/21/2008

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Term
Democritus
Definition
Theory :
Atoms made of tiny, nindividable particles called attoms.

Atoms were nondividable, indestructible, findamental units of matter
Term
Dalton, 1801
Definition
Theory:
Elements are made of atoms: submicroscopic particples
All atoms in element are identical
Atoms of an element are different from other elements
Chemical reactions occur when atoms are Separated, Joined, or Rearranged
Atoms of one element never change chemically into other elements
Term
Rutherford, 1911
Definition
Came up with theory of the atom
Knew previous info- pos and neg., subdivided- but theory was soup like- evenly distributed
Gold experiment- protons shot onto/through gold.
Some of the gold deflected at major angles and some shot back
Discovered the nucleus
Term
Nucleus
Definition
Pos. charged proton in small volume
electrons like mosquitos
nucleus is mega tiny
the nuclear charge holds in all together
no two electrons are the same
Term
Atomic Number
Definition
Number above the letter in table
Number of protons in nucleas, and # of electrons
Periodic table organized by atomic number
It's an exact value
Term
atomic mass unit
Definition
1 proton= 1 amu
1 neutron = 1 amu
1 amu = 1/12 carbon 6 atom
1 proton = 2000 x electron mass
Term
Mass number
Definition
Fore any atom, mass number is
the sum of protons and neutrons in nucleus
Below the letter
Term
Alkali Metals
Definition
Elements of Group 1A except hydrogen.
These are soft, shiny metals
Term
Alkaline Earth Metals
Definition
Group 2A elements.
all give up 2 electrons
Term
Atom
Definition
The smallest particle of an element that retains the characteristics of the element
Term
Atomic Mass
Definition
The weighted average mass of all the naturally occurring isotopes of an element
Term
Atomic Mass Unit
Definition
A small mass unit used to describe the mass of very small particles such as atoms and subatomic particles.
1 amu = 1/12 mass of carbon-12 atom
Term
Atomic Number
Definition
A number that is equal to the number of protons in an atom
Term
Chemical symbol
Definition
An abbreviation that represents the name of an element
Term
electron
Definition
a negatively charged subatomic particle having a very small mass that is usually ignored in calculations.
sumbol is e-
Term
electron dot symbol1
Definition
The representation of an atom that shows valence electrons as dots around the symbol of the element
Term
energy level
Definition
level within the atom that contains electrons of a similar energy
Term
group
Definition
a vertical column in the periodic table that contains elements having similar physical and chemical properties
Term
group number
Definition
a number that appears at the top pof each vertical column (group) in the periodic table and indicates the number of valence electrons
Term
Halogen
Definition
Group 7A
ELEMENTS OF FL, CL, BR, I, AT
Term
ionization energy
Definition
the energy needed to remove the least tightly bound electron from the outermost energy level of an atom
Term
isotope
Definition
an atom that differs only in mass number from another atom of the same element. Isotopes have the same atomic number (number of protons) but different number of neutrons
Term
Mass number
Definition
the total number of neitrons and protons in the nucleus of an atom
Term
metal
Definition
an element that is shiny, malleable, ductile, and a good conductor of heat and electricity. The metals are located to the left of the zigzag line in the periodic table
Term
Mettalloid
Definition
Elements with properties of both metals and nonmetals located along the heavy zigzag line on the periodic table
Term
neutron
Definition
a neutral subatomic particle having a mass of 1 amu and found in the nucleus of an atom. It's symbol is n or n0
Term
noble gas
Definition
an element in group 8A of the periodic table, generally unreactive and seldom found in combination with other elements
Term
Nonmetal
Definition
an element with little or no luster that is a poor conductor of heat and electricity.
Located to RT of zigzag line in periodic table
Term
Nuclear Symbol
Definition
An abbreviation used to indicate the mass number and atomic number of an isotope
Term
Nucleus
Definition
compact, very dense center of an atom. Conatins protons and neutrons.
Term
Period
Definition
horizontal row of elements
Term
Proton
Definition
Positively charged subatomic particle having a mass of 1 amu and found in the nucleus of an atom. Symbol is p or p+
Term
Representative Element
Definition
found in groups 1a-8a- excluding groups 3-12
Term
subatomic particle
Definition
a particle within an atom. Inclludes protons, neutrons, and electrons
Term
transition element
Definition
an element within 2a and 3a
Term
valence electrons
Definition
electrons in the outermost energy level of an electron
Term
intertransition metals
Definition
14 on bottom. They belong on column 3
Ce-Lu
Term
Number of groups in periodic table
Definition
2 on left, 6 on right, 10 in middle, 14 on bottom

remember by prime numbers x 2:
1,3,5,7
Term
BrINCiHOF
Definition
Br2 I2 N2 CL2 H2 O2 F2

unreacted and diatonic
can't be cut down to 1 atom
Term
Hydrogen's electrons
Definition
If it loses an electron in water, it's called an acid

If it loses an electron, it's a hydride
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