Question

plzz plzz... answer it also correctly... nd don't send any invalid ans... be fast...​

Answer 1

Answer:

9. (d) 16

10. (a)

11. (B) one of the oxygen atoms has gained two neutrons

HOPE IT HELPS U

PLEASE MARK AS BRAINLIAST

Answer 2

Answer:

9. mass no.= no. of protons + no. of neutrons

27= x + 14

x= 27-14

x= 13

initially no. of electrons = no. of protons i.e intially there were 13 electrons...now charge is +3 so 3 electrons are lost so no. of electron is 10

9. b)

10.d)

11. d) since there is difference in no. of neutrons and difference in no. of neutrons leads to difference of mass , thus they are isobars