electricity and eletronic help

[Guest sallylonglegs19]

an example of an atom that has no charge is one that has

A. 2 protons, 2 electrons, and 1 neutron

B. 1 proton, 2 electrons, and 3 neutrons

C. 3 protons, 1 electron, and 3 neutrons

D. 3 protrons, 2 electrons, and 1 neutron

 

if an electrically uncharged body is contacted by an electrically charged body, the uncharged body will

A. develope the opposite charge as the charged body

B. remain a neutral charged body

C. develop the same charge as the charged body

D. neutralize the charged body

[aommaster]

well, what are you exactly looking for?

[Sayonara]

Well one proton (positive charge) "cancels out" one electron (negative charge), and neutrons (effectively no charge) won't make any difference either way, so the first question should be fairly simple to work out.

 

For the second question it will help to think about what electrical charge actually is. Electrons are the only subatomic particles that are free (under normal conditions) to carry a charge around, and they have a negative charge.

If a body is packed with extra electrons it will be negatively charged, and in contact with a conductor some of those will "want" to leave. If a body has an electron deficit it will be positively charged, and on contact with a conductor it will try to "get" more electrons.

 

That's a bit simple, but it should put you on the right track

[aommaster]

I was just thinking, for part B, won' the atom be negatively charged? If so, then why did sallylonglegs19 say that she wants an atom with NO CHARGE?

[JaKiri]

aommaster said in post # :

I was just thinking, for part B, won' the atom be negatively charged? If so, then why did sallylonglegs19 say that she wants an atom with NO CHARGE?

 

Two seperate questions I reckon.

[aommaster]

hmm.. doesn't look like it though, cause it looks more to me like a list!

[Sayonara]

They are two different multiple choice questions, clearly.

[aommaster]

oh! I got it now!

[Kedas]

1) A

(neutrons are like there name says: neutral)

 

2) C

(we assume conductive bodys)

(D is only right when the uncharged body is earth)

[Sayonara]

Rule 1 Kedas: http://www.scienceforums.net/forums/showthread.php?s=&threadid=972

 

We tell them how, not the actual answer