This is a combination reaction because two molecules becomes one
A + B ---> AB
If you start with 40.0 grams of the element at noon, 10.0 grams
radioactive element will be left at 2 p.m. The correct answer between
all the choices given is the second choice or letter B. I am hoping that this
answer has satisfied your query and it will be able to help you in your
endeavor, and if you would like, feel free to ask another question.
Pure chemistry: gain knowledge for own pleasure
Applied chemistry: gain knowledge to know how to use it
It showed that the nucleus is positively charged, and that the atom isn't just made of electrons.
Answer:
AMEN NNNNNNNNNNNNNNNNNNNNNNNN