It could be the third and the first one.
The mass number of an element tells us the number of protons AND neutrons in an atom (the two particles that have a measurable mass). Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.
Answer:
The answer is heat a saturated sugar water solution, dissolve more sugar, then let the solution cool
Explanation:
Resultant force is 400-600=-200N.
-200=60a solve for a.
