1, 2, and 4
16 + 12 = 28
1, 2, and 4
The value of (A-Z) for magnesium-28 can be calculated using the atomic mass number (A) and the number of protons (Z). For magnesium-28, A is 28, and Z, the atomic number of magnesium, is 12. Thus, (A-Z) = 28 - 12 = 16. Therefore, the value of (A-Z) for magnesium-28 is 16.
16 and 12
16 (16+12=28)
Well, honey, 16 can go into 28 a grand total of 1 time with a remainder of 12. It's simple math, darling. Just divide 28 by 16 and you'll see that 16 fits in there snugly once, but there's still a little leftover bit of 12 hanging around.
-12+28 = 16
16+12=28
Simply add the two numbers. 28 is 12 more than 16.
It is the middle value of: 12 16 28 76 and 89 which is 28
28
20+8, DUH!