Question

How do you find eletrons for an ion

for example 27/14 Si has 14 protons and 13 neutrons and I know that for ions protons don't equal elcectrons

or 29/19 Si

also how do you do this

write the balanced nuclear equations for the positron emission of Si-27.

Answer 1

Note that the only way to identify number of electrons is via:

- if neutrally charged ( i.e. 0 ) electrons = protons

- if +x charged, then electrons = protons - x

- if -x charged, then electrons = protons + x

The stated isotopes have NO CHARGES

therefore, they ar eassumed to be neutral, i.e. they have the same amount of protons than electrons

for

Si = 14 electrons

note that 29/19 Si won't exist, since 19 can't be Silicon, since it has atomic no. 14

write the balanced nuclear equations for the positron emission of Si-27.

²⁷₁₄ Si → ²⁷₁₃ Al + e+ + ν e