PDF chapter test TRY NOW

Select the right word given in the box:
 
 neutral
hydrogen
 Proton
subatomic particles
 Valency
 number of protons
 Negative
 Electron
 Mass number
atom
nucleus
empty space
  
1. An atom is electrically.
 
2. is defined as the combining capacity of an element.
 
3. The element having no neutron in the nucleus of its atom is.