Answer:
The mass number is the sum of protons and neutrons. This means to find the number of neutrons you subtract the number of protons from the mass number. On the periodic table, the atomic number is the number of protons, and the atomic mass is the mass number.
Explanation:
Answer:
water is not a solid and a rock is a solid
Physics: Physics is more focused to finding the universal laws of general processes
Chemistry: Chemistry focuses more on details and specific phenomena, such as what is the boiling point of this substance and why.
When the neutrons and electrons are the same. For example, sodium (Na) has an atomic mass of 11, meaning it has 11 protons and 11 electrons etc.
