Which of the atoms below has the lowest atomic mass?

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Which characteristics affect ocean water’s temperature? check all that apply. depth location mass salinity waves

Can anyone answer these questions? ? i need it before 1: 00pm today