I believe your answer would be helium friend :)
A should be the answer because the more you test an experiment the more data you have to rely on changing the experiment would cause you to have different outcomes making the results different and unreliable so B, C, and D is not going to be the answer Hope this helps
Answer:
K is a group 1 element while Ne is a group 0 element
K is a good reducing agent while Ne is inert
K is metal while Ne is a gas
K has one valence electron while Ne has no valence electron
Explanation:
Answer:
Malachite
Explanation:
Malachite is the only listed compound that must contain copper and oxygen.
Copper and oxygen are both elements found on the periodic table. They have the following symbols;
Copper = Cu
Oxygen = O
From the given choices, only option 1 has the symbol Cu and O.
So only malachite contains both copper and oxygen.
