Is oxygen a metal or nonmetal ? How many valence electrons d oes an oxygen atom have?

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

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

At a temperature of 393 k, the temperature of a sample of nitrogen is 1.07 atm what will the pressure be at a temperature of 478 k