Question

An ion M^-3 contains 10 electrons and 7 neutrons. What is the atomic no. and the mass no. of element M? Name the element.

Answer 1

Hii ....

Here is your answer...

M3- that means it has gain 3 electrons

Now M3- have 10 electrons

So M have 10 - 3=7 electrons

Atomic no = no of protons = original no of electrons

So atomic no is 7 which is nitrogen

Atomic mass = no of ( protons + neutrons)

7+7 =14u

Therefore.....

Atomic no. = 7

Atomic mass = 14u

Element = Nitrogen

HOPE THIS WILL HELP YOU.....

Answer 2

hey mate!!

its atomic no° =7


atomic no° = no° of protons

i.e 7 e- because(it has -3charge on it) + 7

masd no° = 7 ×2 =14

name of element = Nitrogen.

hope it will help u..


#Phoenix