1. How do transition elements differ from elements in Groups 1 and 2?
A. They are less stable.
B. They are usually gases at room temperature.
C. They are more stable.
D. They are brittle and powdery.

- "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)."

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

14,16 18 reacts with group