Orbitals are defined by which term?

• spin direction
• energy level
• composition
• number of electrons

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

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest