One may conceive light to spread successively, by spherical waves. –Christiaan Huygens, 1600s
What theory was Huygens writing about?
the particle theory of light
the reflection of light off objects
the way objects refract light
the wave theory of light

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

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

gas

explanation:

smoke is the matter of a gas