Please I confused between choices

1.43*10 to the power of -10

Explanation:

Since 1.43*10 to the power of -10 is nothing else but

1.43/10¹⁰ which is equal to the number in the question

It is not 10¹⁰ because it will increase the number of zeros to the right

but we need to increase it towards the left

Hope this helps

the answer is barium and copper bromide

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