The atomic number of an element whose atoms have 10 protons and 19 neutrons is .

The atomic number of an element whose atoms have 10 protons and 19 neutrons is 10.

Explanation:

The amount of protons in an element is unique to that specific element and it is also known as the atomic number. If the number of protons were to change to any other number than the element would also change. Protons define the element, and the atomic number is found in the number of protons.

your answer should be 10 :)

Explanation:

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."