Which element has an atom with the greatest tendency to attract electrons in a chemical bond?
(1) carbon (3) silicon
(2) chlorine (4) sulfur

(2) chlorine

Expalanation: 1) Carbon is an element with atomic number 6 and thus has 6 electrons. It's electronic configuration is:

Carbon needs to lose or gain 4 electrons to attain noble gas configuration.

2) Chlorine is an element with atomic number 17 and thus has 17 electrons. It's electronic configuration is:

Chlorine needs to gain 1 electron to attain noble gas configuration and thus has strongest tendency to attract electrons in a chemical bond.

3) Silicon is an element with atomic number 14 and thus has 14 electrons. It's electronic configuration is:

Silicon needs to lose or gain 4 electrons to attain noble gas configuration.

4) Sulfur is an element with atomic number 16 and thus has 16 electrons. It's electronic configuration is:

Sulfur needs to gain 2 electrons to attain noble gas configuration.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally