Answer:
Id say A. Competition, hope this helps
Explanation:
Is this a multiple answer?
Answer:
Matter:
toothpaste
gasoline
bacteria
cell
Not matter:
happiness
sound
Explanation:
Matter is something that has mass and volume. Happiness is just a feeling, it doesn't exist in 3d world. Sound is a wave or just the movement of matter (particles of matter). Others have masses and volumes.
Answer:
10 neutrons
Explanation:
N=Z-A ie. number of neutrons=mass number-atomic number
N=19-9=10
Your answer would be, Gas atoms subjected to the electricity emit bright lines of light.
Hop that helps!!!