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Please answer the following questions. Click on 'Done' button when done.

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// Related to the concept map - c
RADIOBUTTON 
Which of the following statements is correct:
An electron always has no charge.
If the charge of an entire atom is 0, that means positive and negative pieces are not equal.
A proton always has a positive charge.
A neutron always has negative charge.
None of the above

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// Based on structure - d
RADIOBUTTON 
Which of the following is a type of mixture:
atom
proton
compound
homogeneous substance
element

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// Unrelated to the concept map - e
RADIOBUTTON 
Common salt is: 
KOH
HCl
NaOH 
KCl
NaCl 

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// Related to the concept map - a
RADIOBUTTON 
Which of the following statements is NOT true	  
Elements are composed of two or more compounds chemically held together.
Neutrons are uncharged particles found within atomic nuclei.
A homogeneous mixture has the same uniform appearance.
Heterogeneous substances are made of different substances that remain physically separate.
An atom consists of three particles.