Chapter 2 UTA
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Anything that takes up space and has mass
Substance that cannot be broken down to other substances
How many recognized elements are there?
Substance containing a fixed ratio of 2 or more different elements
How many essential elements are there
Elements only required in minute quantities such as Iron(Fe)
Neutrally charged subatomic particle located in the nucleus. Weighs about 1 Dalton
Positively charged subatomic particle located in the nucleus. Weighs about 1 dalton
Negatively charged subatomic particle weighing much less than neutrons and protons.
Number of protons in an element. Written to the left of the element symbol
Sum of protons and neutrons in an element.
- Mass number
- Subtract the atomic number from the mass number to equal the number of neutrons.
variation of an element. The only difference is the mass which is changed by an increase in neutrons.
An unstable isotope in which the nucleus decays spontaneously, giving of
particles and energy. The result is transformation from one type of
atom to an atom of a different element.
the capacity to cause change
energy that matter possesses because of its location or structure
different states of potential energy that electrons have within an atom
An electrons energy level based on how far away it is from the nucelus
Electrons located in the outer shell of an atom
the outermost shell of electrons
Which 3 elements are unreactive?
Helium, Neon, Argon
an attraction between electrons on incomplete valence shells of 2 different atoms.
the sharing of a pair of valence electrons by 2 atoms forming a molecule
2 or more atoms held together by covalent bonds
one dash line linking together 2 atoms
the number of unpaired electrons in the atoms valence shell
attraction of a particular kind of atom to one another.
- the stronger the electronegativity the stronger it pulls shared electrons toward itself
a covalent bond between the same element
non polar covalent bond
when electrons are bonded with different elements.
Polar covalent bond. One atom will be more electronegative.
when two atoms have a major difference in electronegativity that the stronger atom pulls the electron away from the weaker atom
a charged atom or molecule due to ionic bonds.
a positively charged ion.
- when Na is bonded with Cl.
negatively charged ion
- Cl when it bonds with Na
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