Select all that apply.


1: Which of the following particles are of approximately equal mass?


A: protons

B:electrons

C:neutrons

D:quarks

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2: If the atomic number of an element is 16, then it has 16 electrons.


True

False

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3: An unknown substance is tested and found to have the following physical properties:


brittle

fair conductor of electricity

dull (not shiny)


The substance is most likely a _____.


A:metal

B:metalloid

C:nonmetal

D:can not be determined without more data

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