Question

If the following elements were to form ions, they would attain the same number of electrons as which noble gas?
elements: Be, Ca, Al, Rb, Se, F, P
noble gas: He, Ne, Ar, Kr

Answer 1

You need to first identify what group those elements are in first

Beryllium and calcium are both in group 2. they are metals so they are going to lose 2 electrons. Calcium has 20 electrons and 20 protons, if it loses 2 electrons it's configuration resembles Argon.
Beryllium has 4 protons and 4 electrons. if it loses 2 electrons it has 2 electrons now and this configuration resembles helium.

Answer 2

@claudia_lcl

Answer 3

Try fluorine and tell me what noble gas it would represent

Answer 4

Fluorine has 9 protons and 9 electrons?

Answer 5

yes

Answer 6

does it want to gain electrons or lose them?

Answer 7

Does that mean it's going gain 1 electron

Answer 8

yes exactly, how do you know?

Answer 9

because fluorine is not an ion, so it usually gain electrons, and also it's on the right side of the periodic table

Answer 10

yes, fluorine has a tendency to gain an electron because of it's position on the periodic table, and because of it's high electronegativity

Answer 11

But i still do not understand which noble gas does it represent. Isn't there is no charges for noble gas?

Answer 12

@claudia_lcl so that's right noble gases don't have charges, but an electron configuration can be similar to the noble gases.

if fluorine gains say one electron

take a look, what electron configuration does it represent now that it has 10 electrons?
HINT: what element has 10 electrons on the periodic table