How do scientists determine the number of neutrons in an isotope of an atom?
A. They find the number of protons.
B. They divide the atomic mass by two.
C. They add the number of

electrons and protons.
D. They subtract the atomic number from the atomic mass.

B. atomic number from mass number. Atomic number - mass number gives us the number of neutrons in an atom.

eturker|Points 2667|

koaley|Points 6227|

Expert answered|Booknerd_lizzy|Points 300|

Question

Asked 10/22/2012 4:12:05 PM

0 Answers/Comments

Rating

There are no new answers.

Find the difference.
8 – 12
A. –20
B. –4
C. 4
D. 20

Question

Expert Answered

Updated 237 days ago|8/6/2014 6:31:03 PM

1 Answer/Comment

The difference for 12 – (–17) is 29.

12-(-17)

=12+17

=29.

12-(-17)

=12+17

=29.

Added 237 days ago|8/6/2014 6:27:31 PM

This answer has been confirmed as correct, not copied, and helpful.

Confirmed by andrewpallarca [8/6/2014 6:31:13 PM], Rated good by andrewpallarca

Find the difference.
12 – (–17)
A. –29
B. –5
C. 5
D. 29
**Weegy:** The difference of 12 ? (?17) is: D. 29 **User:** Choose the correct answer.
Which expression has a value of 27?
A. –15 – (–12)
B. –25 – 2
C. 10 – 17
D. 16 – (– 11)
**Weegy:** D. 16 – (– 11)
seems to be closest answer. (More)

Question

Expert Answered

Asked 10/15/2012 12:46:29 PM

0 Answers/Comments

Choose the correct answer.
Which expression has a value of 27?
A. –15 – (–12)
B. –25 – 2
C. 10 – 17
D. 16 – (– 11)
**Weegy:** D. 16 – (– 11). The expression 16 – (– 11) has a value of 27. (More)

Question

Expert Answered

Asked 10/15/2012 1:01:15 PM

0 Answers/Comments

What is the value of the expression q + 39 when q = –12?
A. –51
B. –27
C. 27
D. 51
**Weegy:** C. 27. If q is -12, then the value of -12 + 39 is 27. (More)

Question

Expert Answered

Asked 10/15/2012 1:08:17 PM

0 Answers/Comments

What is the value of the expression 1 – r – a when r = 20 and
a = 6?
A. –27
B. –25
C. –15
D. –13
**Weegy:** B. –25. If r is 20 and a is 6, then the value of 1 - 20 - 6 is -25. (More)

Question

Expert Answered

Asked 10/15/2012 1:14:01 PM

0 Answers/Comments

20,209,053 questions answered

Points 0 [Total 0]| Ratings 0| Comments 0| Invitations 0|Offline

Points 0 [Total 0]| Ratings 0| Comments 0| Invitations 0|Offline

There are no comments.