Shared Flashcard Set

Details

Physics First Chapter 9
The Atom
31
Physics
9th Grade
11/29/2007

Additional Physics Flashcards

 


 

Cards

Term
the atomic theory
Definition

all matter is composed of tiny particles called atoms

Term
John Dalton
Definition
a brilliant school teacher who published the Atomic Theory
Term

J. J. Thompson

Definition
discoverd the electron
Term
Ernest Rutherford
Definition
discovered the nucleus
Term
particles in the nucleus
Definition
protons and neutrons
Term
particles orbiting the nucleus in a 'cloud'
Definition
electrons
Term

mass and charge of proton

Definition

mass is 1

 

charge is +1

Term
mass and charge of neutron
Definition

mass is 1

 

no charge

Term
mass and charge of an electron
Definition

no mass

 

-1

Term
strong nuclear force
Definition
the force attracting protons and neutrons to each other so the nucleus stays together
Term
strongest force known to science
Definition
strong nuclear force
Term
electromagnetic force
Definition
force holding electrons to the nucleus
Term
affect of gravity on the atom
Definition
no effect
Term
atomic number
Definition
the number of protons in an atom
Term
isotope
Definition
atoms of the same element with different numbers of neutrons
Term
atomic mass or amu
Definition
the mass of protons and neutrons in an atom
Term
periodic table
Definition
organizes the elements according to their chemical properties
Term
Mendeleev
Definition
the father of the periodic table
Term
period
Definition

horizontal row on the periodic table

 

there are 7 periods

Term
group
Definition

vertical column on the periodic table

 

there are 18 groups

 

elements with similar chemical properties are in the same period

 

 

Term

the characteristics of metals

 

Definition

shiny

opaque

bendable (malleable)

good conductor of heat and electricity

Term
the characteristics of non-metals
Definition

dull

brittle

poor conductors of heat and electricity

Term

metalloids

Definition

elements having properties of both metals and nonmetals

 

they are weak conductors of electricity and are often used as semiconductors in computer circuits

Term
metals
Definition
most of the elements in the periodic table
Term
valence electron
Definition
electrons in the outermost energy level
Term
maximum number of valence electrons in the outer level
Definition
8 valence electrons
Term
chemical bond
Definition
atoms trade or share electrons
Term
noble gas
Definition

element with a full outer level of electrons

 

8 valence electrons in the outer level

 

inert - they do not combine with other elements

Term
an atom with 2 protons
Definition
helium
Term
an atom with 7 protons and 8 neutrons
Definition

nitrogen

Supporting users have an ad free experience!