<em>Refer to the attachment </em><em>!</em><em>!</em><em>!</em>
Answer: D and A
Explanation: just took the test
Answer:
35 amu
Explanation:
In an atom, only masses of protons and neutrons are relevant. electrons are so small in size that their masses are negligible.
The mass of 1 proton/neutron is 1amu.
Answer: This means to find the number of neutrons you subtract the number of protons from the mass number.