Elements Flashcards
What is a molecule?
Two or more of the same or different atoms bonded together
Which element is most important to life
Carbon
What is a compound?
Two or more different elements bonded together. A compound is a type of molecule.
Which 6 elements are most common in living organisms?
Carbon, phosphorus, sulfur, hydrogen, oxygen, nitrogen
What is a chemical formula
Describes the type and amount of atoms
What is an isomer?
Substances that share chemical formulas but have different structures
How many atoms of each element are there :
C(16)He(9)N(2)
Sixteen carbon atoms, nine helium atoms, and two nitrogen atoms
What is atomic number?
The number of protons OR electrons
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What is atomic mass?
The weight of the nucleus, protons plus neutrons
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What is the charge of a neutron?
Neutral (0)
What is the charge of a proton?
+1 (positive)
What is the charge of an electron?
-1 (negative)
How many bonds can carbon make?
4
How many bonds can oxygen make?
2
How many bonds can hydrogen make?
1
How many bonds can Nitrogen make?
3
Chemical behavior is dependent on what?
Number of electrons in the valence shell
What is an ion?
An atom that has added or lost and electron.
What is an isotope?
An atom with the same number of protons but a different number of neutrons.
All non-reactive elements have what?
Full valence shells
All reactive elements have what?
Incomplete valence shells.
H is hydrogen’s what?
Chemical symbol
