Which of these statements is incorrect regarding an atom of the element scandium?
a. it has 21 negatively charged electrons
b. it has 21 positively charged protons in its nuclear
c. it has 21 neutrons in its nucleus
d. its chemical symbol is sc

- "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)."

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.