Focus On Physical Science: California Grade 8

Lesson 1: Atoms—Basic Units of Matter

Standards Check

1.
Most of an atom's mass is contained in __________. 3.a
A)the electron orbits
B)its nucleus
C)the electron cloud
D)its outer energy shell
2.
Matter takes up __________. 3.a
A)heat and temperature
B)space and temperature
C)space and mass
D)space and heat
3.
What nineteenth century scientist combined the idea of elements with the Greek theory of the atom? 3.a
A)Isaac Newton
B)J.J. Thomson
C)Ernest Rutherford
D)John Dalton
4.
What particle in an atom is electrically neutral? 3.a
A)neutron
B)proton
C)electron
D)alpha
Grade 8
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