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27 Cards in this Set
- Front
- Back
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the smallest pasrt of an emement that still has the properties of that element is
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an atom
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O
2 |
element
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Ar
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element
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KCl
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compund
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H
2 |
element
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Al
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element
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NH
3 |
compound
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concrete- ? ( mixture pure substance )
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mixtre
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water
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mixture
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oxygen
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pure substance
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air
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mixture
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why do helium filled ballons and hot air ballons float in air
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helium is less sense than air
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how do you find density
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mass divided by volume
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which of the following statements about a heluim atom in the sunf and a helium atom on earth is false
a. they are likley to have the same chemicl properites b.they are likley to have similar physical properties c. one will be five minutes more massive d.niether one will be veey chemically reactive |
c
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a subatomic particle that has a negative ccharged is called an
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electron
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nuertons have a negative charge
true or false |
false
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what is an atoms nucleus made of
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protons and nuetrons
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avogardo's number is useful for
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counting atoms
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the charge if an atom is
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nuetral
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an elements atominc number is equal to the number of
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protons
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two different isotopes of an element have different
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number of nuertons
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which of the floowing is not a type of orbital
a.s b.d c.p d.x |
d
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an electron to a new energy level when
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the atom gains or looses enegry
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found in the outer energy level of an atom
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valence electron
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where electrons are likley to be found in an atom
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orbital
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unit of light
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photon
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what happens to an electron when it gains energy
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excited state
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