An atom either gains or loses to become an ion.
a) electrons
b) neutrons
c) positrons
d) protons

A

Step-by-step explanation: its  because  if an atom gains a negative  electrons it becomes a negative ion. if it were to loses a  electron it would become a positive ion. the other answers are not able to do both

10

step-by-step explanation:

7+3=10

< coa = 150 ( given)

as ba and bc are tangents

so oc and oa is perpendicular to cb and ab respectively because in circle normal passes through centre

so in quadrilateral oabc

< coa + < oab + < ocb + < abc = 360

150 +90+90 + < abc = 360

330 + < abc = 360

< abc = 360 -330 = 30

so < abc = 30

⭐dhruv⭐