PLZ HELP FAST I WILL MARK BRAINLIEST AND THIS IS MULTIPLE CHOICE!

1) The elements in which Group would most likely form ions that have a charge of -3?

Select one:

a. Group 1

b. Group 3

c. Group 15

d. Group 16

2) The elements in which Group would most likely form ions that have a charge of +1?

Select one:

a. Group 1

b. Group 2

c. Group 17

d. Group 18

1. c. group 15

2. a. group 1

3. c. m

Explanation:

1. and 2. you just have to know the charge rules.

3. m = mass number = total protons and neutrons

- Hope that helped! Please let me know if you need further explanation.

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