# Please Need help asapFor Al, its atomic number is 13 and its mass number is 27. How many neutrons does it have?А. 13B. 14C. 26D. 27E. 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

## This Post Has 12 Comments

1. winterblackburn78 says:

B. 14

Explanation:

The atomic mass minus the number of protons will give you the number of nuetrons. 🙂

2. naenae2cold12021 says:

14

3. chrisraptorofficial says:

14 i just took this test

4. orlando979 says:

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

5. hannahkharel2 says:

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

6. EthanIsHyper says:

7. patricehill says:

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 🙂

8. Expert says:

They are held together by chemical bonds. i am pretty sure.

9. Expert says:

Enzyme make a hormone as a catalyst

10. emmaja121003 says:

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

11. theresamarieuehling2 says:

14.

Step-by-step explanation:

The number of neutrons = the mass number - atomic number

= 27 - 13 = 14.

12. sugandiwoodbine says:

B.) 14

Explanation:

27-13=14 neutrons