Skip to content

Course home

Sign up

6 Radioactivity

EasyMediumHard
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118
Question 24
F

A neutral atom of sodium is represented by 1123Na{}^{23}_{11}\mathrm{Na}1123​Na.

a.

Give the number of electrons in this atom.

[1]
b.

The sodium atom loses one electron and becomes an ion.

Explain why the ion has a positive charge.

[2]
c.

State the relative charge of the ion.

[1]
d.

Explain why the electron lost is an outer electron and not an electron close to the nucleus.

[2]
e.

A student says:

'When the sodium atom becomes an ion, its mass number changes from 23 to 22.'

Explain why the student is wrong.

[2]
Markscheme

6 Radioactivity Questions

  1. GCSE
  2. /Physics
  3. /6 Radioactivity

Question bank