Please Need help asap For Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have?
А. 13
B. 14
C. 26
D. 27
E. 40
Please Need help asap For Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have?
А. 13
B. 14
C. 26
D. 27
E. 40
B. 14
Explanation:
The atomic mass minus the number of protons will give you the number of nuetrons. 🙂
14
14 i just took this test
7.c
8.a
10.b
12.a
16.b
17.a
18.c
19.b
20.d
21.a
22.a
23.c
24.d
25.a
26.c
27.a
28.b
29.d
30.c
31.d
32.c
B. 14
Explanation:
For an element:
- Atomic number: is the number of protons in the nucleus (p)
- Mass number: it is the number of protons (p) + neutrons (n) in the nucleus
For Al (aluminium), we have:
p = 13
p + n = 27
Substituting the first equation into the second one, we find the number of neutrons:
n = 27 - p = 27 - 13 = 14
14 is the correct answer
The mass number is the total number of protons and neutrons in a nucleus. The atomic number is the number of protons in the nucleus. →27−13=14 neutrons!
I hope that helps. I don't know if it right or wrong, but good luck 🙂
They are held together by chemical bonds. i am pretty sure.
Enzyme make a hormone as a catalyst
14
Explanation:
The atomic # is how many protons it has, the mass is the total number of protons (P) and neutrons (N).
P+N=M 13+N=27
27-13=14 Neutrons= 14
14.
Step-by-step explanation:
The number of neutrons = the mass number - atomic number
= 27 - 13 = 14.
B.) 14
Explanation:
27-13=14 neutrons