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McNulty 8th atoms/elements
chapter 6 atoms / elements
26
Science
8th Grade
12/08/2006

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Term
electron cloud
Definition
Area of space around the nucleus where electrons travel
Term
energy levels
Definition
different areas for electrons in an atom
(2, 2, 6, 2, 6, 10, 2, 6, 10, 14)
Term
electron dot diagram
Definition
a symbol for the element surrounded by as many dots as are found in the elements outer energy level
Term
chemical bond
Definition
the force that holds two atoms together
Term
Nucleus
Definition
found in the center of atoms
Term
negative
Definition
what charge do electrons have?
Term
positive
Definition
what charge do protons have?
Term
ionic bonds
Definition
which type of chemical bond loses or gains electrons?
Term
ion
Definition
an atom that is no longer neutral because it has +/- electrons and the number of electrons & protons is no longer equal.
Term
covalent bond
Definition
the chemical bond that forms between nonmetal atoms when they share electrons.
Term
neutral
Definition
Are atoms that are covalently bonded positive, negative, or neutral?
Term
molecule
Definition
the neutral particle formed when atoms share electrons
Term
polar bond
Definition
a bond in which electrons are shared unequally: like water
Term
polar
Definition
sometimes when elements form covalent bonds in which the shared electrons are not shared evenly they are what?
Term
nonpolar
Definition
when element share electrons evenly in covalent bonds they are what?
Term
metallic bonds
Definition
when metal atoms pool their electrons
Term
chemical formula
Definition
a combination of element symbols and numbers
Term
compounds
Definition
multiple elements that are bonded and can be described using element symbols and numbers (H2O)
Term
stable
Definition
noble gases already possess 8 electrons in their outer energy level so they are considered what?
Term
they want to fill up their valance shell with the max electrons it can hold
Definition
Why do elements want to form bonds?
Term
charged atom
Definition
an ion is a ___________ ________.
Term
molecule
Definition
___________is two or more atoms covalently bonded together.
Term
compound
Definition
___________ contains two or more different elements bonded by either covalent or ionic bonds.
Term
periodic table
Definition
The ________ _______ contains lots of data about elements, and it is arranged in columns and rows.
Term
equal
Definition
The number of protons and electrons in an element before any bonding is ______.
Term
atomic number
Definition
You can determine the number of electrons or protons an element has by looking at the elements _____ _____.
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