Shared Flashcard Set

Details

Atoms, etc
atoms, periodic table, element, compound, mixture
17
Science
8th Grade
03/31/2011

Additional Science Flashcards

 


 

Cards

Term
What is matter?
Definition
has mass and takes up space
Term

 

everything is made up of ________

Definition
atoms (matter)
Term
definition of element
Definition
pure substance that cannot be broken down into simpler substances by ordinary chemical means
Term
What are valence electrons?
Definition
the outermost level of electrons
Term
Hydrogen, Carbon, Li, P, and Chlorine are all examples of __________
Definition
elements
Term
How many elements are on the Periodic Table?
Definition
Over 100 elements (about 118)
Term
which 2 subatomic particles are in the nucleus?
Definition
protons and neutrons
Term
protons have _________ charge
Definition
positive
Term
neutrons have ___________ charge
Definition
neutral (zero/ no charge)
Term
electrons have _______ charge
Definition
negative
Term
electron are found where?
Definition
outside the nucleus in electron cloud
Term
Atomic Number is the number of _________
Definition
protons (always)
Term
atomic mass is the number of
Definition
protons and neutrons
Term
What is an ion?
Definition

positive and negative charge on an atom

ex:  He+2       and        Ti-3

Term
Electrons that are shared are in _________ electron level
Definition
valence or outermost
Term

Cl-2

 

Did Chlorine gain or lose electrons? and how many?

Definition
Gained 2 electrons
Term

What is the atomic number if an atom has

25 protons

27 neutrons

26 electrons

Definition
25 because Atomic number always is the same number as the number of protons
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