You are Here: Home >< Physics

# Can somebody help me witg this physics a level question? watch

1. I know it may seem simple but i cant gey the right answer for question 3a). How would you find the charge?
2. (Original post by yacinesen)
I know it may seem simple but i cant gey the right answer for question 3a). How would you find the charge?
It has lost 2 electrons, therefore it has lost the charge of 2 electrons. What is the charge on an electron?
3. (Original post by Protostar)
It has lost 2 electrons, therefore it has lost the charge of 2 electrons. What is the charge on an electron?
-1.60*10^-19
4. (Original post by yacinesen)
-1.60*10^-19
Yep - so this atom, that started off with no charge, has lost 2 electrons. So it’s lost 2 lots of -1.60 x 10-19C. Can you work it out from here?
5. T

This is the answer i got before but its wrong. Im doing it wrong right?
6. (Original post by yacinesen)
T

This is the answer i got before but its wrong. Im doing it wrong right?
Think of it this way - in an atom, the number of protons = the number of electrons, and protons and electrons have equal but opposite charges. This means the resultant charge of an atom is 0, atoms are neutral.

As two electrons have been lost, this means that there are 2 more protons than electrons in the atom, so it is now an ion. Therefore the charge of this ion is the same as the charge on 2 protons (the same as the charge on 2 electrons, except positive as the atom has lost negative charge)

Does this make sense?
7. (Original post by Protostar)
Think of it this way - in an atom, the number of protons = the number of electrons, and protons and electrons have equal but opposite charges. This means the resultant charge of an atom is 0, atoms are neutral.

As two electrons have been lost, this means that there are 2 more protons than electrons in the atom, so it is now an ion. Therefore the charge of this ion is the same as the charge on 2 protons (the same as the charge on 2 electrons, except positive as the atom has lost negative charge)

Does this make sense?
Yeh makes perfect sense and now I understand. Thanks for your help and time!!
8. (Original post by yacinesen)
Yeh makes perfect sense and now I understand. Thanks for your help and time!!
Awesome! No problem

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 23, 2017
The home of Results and Clearing

### 2,488

people online now

### 1,567,000

students helped last year
Today on TSR

The latest news

### University open days

1. SAE Institute
Animation, Audio, Film, Games, Music, Business, Web Further education
Thu, 16 Aug '18
2. Bournemouth University
Fri, 17 Aug '18
3. University of Bolton