HELP IN CHEMISTRY PLEASE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

1.) what is the change in the atomic number when an atom emits a beta particle ?
a.) decrease by 2
b.) decrease by 4
c.) increase by 2
d.) increase by 4

2.) what is the change in atomic number when an atom emits a beta particle?
a.) decrease by 1
b.) increase by 1
c.) no change
d.) none of the above

3.) how many neutrons are in a nucleus of I-131? Iodine has an atomic number of 53.
a.) 53
b.) 78
c.) 131
d.) none of the above

4.) what is a positron?
a.) the highest energy radiation known
b.) a nucleus with a positive charge
c.) an particle with the same mass as an electron, but with a positive charge
d.) a unit of measure for low level radiation

1.) what is the change in the atomic number when an atom emits a beta particle ?
none of the above answers,
so I bet your question was supposed to be to "emits a alpha particle"
your answer is
a.) decrease by 2
http://www.cartage.org.lb/en/themes/scie…


2.) what is the change in atomic number when an atom emits a beta particle?
it incereases atomic number by 1
http://www.cartage.org.lb/en/themes/scie…



3.) how many neutrons are in a nucleus of I-131? Iodine has an atomic number of 53.
131 - 53 = your answer:
b.) 78


4.) what is a positron?
c.) an particle with the same mass as an electron, but with a positive charge
http://en.wikipedia.org/wiki/Positron