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15 Cards in this Set

  • Front
  • Back
The four most common elements in living organisms are:
O, C, H and N
The nucleus of an atom contains:
protons and neutrons
Which of the following What are the 3 subatomic particles and what are their charges:
Protons have a positive charge
Electrons have a negative charge
Neutrons have no charge
What two subatomic particles make up the mass of an atom?
protons and neutrons
The atomic number of an atom is:
the number of protons in the atom
The further an electron is from the nucleus, the (greater, lower) its energy
Greater
The closer an electron is from the nucleus the (greater, lower) its energy
Lower
An isotope has more ________ than a typical atom
neutrons
The innermost electron shell of an atom contains how many electrons?
2
The outermost electron shell contains how many electrons?
8
True or False The atomic number is the same as the number of electrons in its base state
True
Atoms or groups of atoms that have become electrically charged by gaining or losing electrons are called
ions
The chemical bond formed when atoms share electrons is called
Covalent bond
A molecule with an electrical charge due to the unequal sharing of electrons by its atoms is called a
polar molecule
True or False The ability of water molecules to form hydrogen bonds with other water molecules is critical to the milder temperatures of coastal regions when compared to inland areas, evaporative cooling of skin surfaces, the movement of water from the roots of a tree to its leaves, and the lower density of ice compared to liquid water
True