I agree with these. The one you have trouble with is below.
3. 56 25Mn ---> _____ + 0/-1e
56/27Co
27/56Mn
56/26Fe
58/24Cr
I don't know this one.
I think it is easier to see if we separate the numbers. I will write that as 25Mn56 ==> -1e0 + X
The numbers to the left must add up on both sides. The numbers on the right do the same.
So 25 = -1 + what? Must be 26
Look on the periodic chart and you find 26 is Fe.
Then 56 = 0 + what? must bre 56. So X is
26Fe56.
1.
What is the change in atomic mass number when an atom emits an alpha particle?
decreases by 2
*decreases by 4
increases by 2
increases by 4
2.
If an isotope decays by the process of beta emission, ____.
the mass number changes
*the atomic number changes
protons are given off
the number of neutrons remains the same
3. 56 25Mn ---> _____ + 0/-1e
56/27Co
27/56Mn
56/26Fe
58/24Cr
I don't know this one.
4.
Which of the following naturally occurring radioisotopes would be most useful in dating objects thought to be millions of years old?
carbon-14; t1/2= 5.73 x 103 years
*potassium-40; t1/2= 1.28 x 109 years
thorium-234; t1/2= 25 days
radon-222; t1/2= 3.8 days
5.
The production of carbon-14 ____.
*takes place in the upper atmosphere
is mostly due to fallout from nuclear explosions
occurs to a large extent in nuclear reactors
is caused by photsynthesis in plants
Thank You.
10 answers
Test
you guys suck bro
reee and Test the person is not asking for your names
1.B
2.B
3.C
4.B
5.A
2.B
3.C
4.B
5.A
The person above is right
who here is doing connexus ?!?!?!
me @connexusisbroken-214
thankkk uu person above correct
YES!!!!!!!!!!!!!!! 100% CORRECT O_O