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isotopes 1 mark chem question URGENT pls help :(

this is what the q says.

Isotopes of tungsten include 82W and 86W.

Deduce the number of neutrons in 86W,

and the answer is 112???? I just dont get why the numbers are 82 and 86 as this should be the mass number right?? not the number of neutrons or something?? sorry does my q even make sense lol :frown:

Reply 1

danielhaslam19

The number of neutrons in a nucleus is equal to the mass number (top number) take away the atomic number (bottom number).

You must be reading something wrong there. Take a picture of the question?

Reply 2

username4250206

Hi, the answer is 12 as:
n. neutrons = mass number - atomic number
in this case:
n. neutrons= 86- 74= 12
So honestly I think the answer is a typo. Hope this helps!

Reply 3

danielhaslam19

Original post by Valeriex

Hi, the answer is 12 as:
n. neutrons = mass number - atomic number
in this case:
n. neutrons= 86- 74= 12
So honestly I think the answer is a typo. Hope this helps!

This one ^^^

Reply 4

username3477548

Original post by Valeriex

Hi, the answer is 12 as:
n. neutrons = mass number - atomic number
in this case:
n. neutrons= 86- 74= 12
So honestly I think the answer is a typo. Hope this helps!

Original post by danielhaslam19

The number of neutrons in a nucleus is equal to the mass number (top number) take away the atomic number (bottom number).

You must be reading something wrong there. Take a picture of the question?