How many neutrons does element x have if its atomic number is 25 and its mass number is 85?

60 neutrons

Step-by-step explanation:

We are given that the atomic number of an element X is 25 and its mass number is 85 and we are find the number of neutrons this element has.

We will use the following formula to find the number of neutrons:

Neutrons = Atomic mass number - Atomic number

So substituting the given values in the above formula to get:

Number of neutron = 85 - 25 = 60

Therefore, element X has 60 neutrons.

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer