Question

Given the following three electron configurations:

1s^2 2s^2 2p^5

How many core electrons does this element have?

Answer 1

@TheSmartOne

Answer 2

@TheSmartOne

Answer 3

@Abhisar would know dis :P

Answer 4

This could help. http://openstudy.com/study#/updates/54da6102e4b0f48016fdb20c

Answer 5

@JoannaBlackwelder The answer is 5 right?

Answer 6

No...

Answer 7

Oops I mean 3 not 5!

Answer 8

Core electrons are the electrons that are not valence.

Answer 9

No, not 3 either....

Answer 10

Look at the link, vera. No one can't give you answers.

Answer 11

Oh...then what is it?

Answer 12

The highest energy level contains the valence electrons.

Answer 13

Ohhh so it's 9 right?

Answer 14

The highest energy level is 2 (The 2s^2 2p^5 part)

Answer 15

http://openstudy.com/study#/updates/54da6102e4b0f48016fdb20c
This link will help. It has all of the information.

Answer 16

Thank you for explaing it to me! @JoannaBlackwelder

Answer 17

You're welcome. :) Can you tell how many core electrons there are now?