15. Five marks exercise problems XIII

An atom can contains protons which have a positive charge $(+)$ and electrons which have a negative charge. $(-)$. When an electron and a proton pair up, they become neutral $(0)$ and cancel the charge out. Now, determine the net charge:

 

(i) $5$ electrons and $3$ protons $=$  electronprotonneutral

  

(ii) $6$ protons and $6$ electrons $=$ protonelectronneutral

  

(iii) $9$ protons and $12$ electrons $=$  protonelectronneutral

  

(iv) $4$ protons and $8$ electrons $=$  electronprotonneutral

  

(v) $7$ protons and $6$ electrons $=$  neutralelectronproton