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Physical science chapter 20
Terms in this set (23)
What two elements make up table salt?
Sodium and chlorine
Tells what elements a compound contains and the exact number of atoms in each element in the unit of that compound
What does subscript tell you
The number of atoms of that element in the formula.
Where is the subscript written?
lower right of the element symbol
Why do the noble gases NOT form compounds readily?
Their outer energy levels have 8 valence electrons
When is an atom chemically stable?
when its outermost electron shell is filled
How do atoms with partially filled outer energy levels become stable?
They can lose, gain, or share electrons
the force that holds two atoms together
a charged particle that forms when an atom or group of atoms gains or loses one or more electrons
What force holds compounds together?
indicates the charge of an ion
Which element in a compound changes the ending to ide?
The one gaining the electron
Formed when one or more electrons are transferred from one atom to another
What charge does an ionic bond have?
Why do elements in group 14 share electrons rather than give them away?
They're more chemically stable if they share and less energy is being used to share
a bond formed when atoms share one or more pairs of electrons
Neutral particle formed by covalent bonding
How is a single covalent bond formed?
Two atoms share two electrons
What are characteristics of compounds formed by covalent bonds?
Liquids or gases at room temperature
Why do some compounds share electrons unequally?
It depends how far away electrons are in relation to the nucleus and how big the positive charges of the nucleus.
a molecule in which one side of the molecule is slightly negative and the opposite side is slightly positive but the overall charge is neutral
No polar molecule
one in which electrons are shared equally in bonds so they don't have oppositely charged ends
What type of atoms form non-polar molecules?
Two atoms that are exactly alike
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