Chemical Basis Of Life
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1
2Chapter 2
Chemical Basis of Life
1.
The five most common elements in living organisms are
a.
C, H, O, Na, Cl
b.
C, H, O, Na, Ca
c.
C, H, O, N, Ca
d.
C, N, O, Na, Cl
e.
C, N, O, Ca, Fe
2.
The atom sodium contains 11 electrons, 11 protons, and 12 neutrons. What is the mass
number of electrons?
a.
0
b.
11
c.
22
d.
23
e.
34
3.
The atomic number of an atom is
a.
the number of protons in the atom.
b.
the number of electrons in the atom.
c.
the number of neutrons in the atom.
d.
the number of protons, electrons, and neutrons in the atom.
e.
the net electrical charge of the atom.
4.
When full, the innermost electron shell of an atom contains _____________ electrons,
and the outermost shell contains _____________ electrons.
a.
2 ….. 2
b.
2 ….. 8
c.
4 ….. 8
d.
8 ….. 2
e.
8 ….. 8
5.
A(n) ___________ forms when two atoms share electrons.
a.
ion
b.
polar covalent bond
c.
covalent bond
d.
ionic bond
e.
either b or c
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