C) 3 Moles
This is because of the molecular structure shown in the image
Explanation:
Atomic number , protons and electrons have the same value / their value is same .
But for the neutron there is no specific technique. You have to remember the neutrons of every element
Answer:
100 J of energy are needed to heat the copper from 20∘C to 80∘C .
Tearing paper, Physical Change
Answer molecule
Explanation: The combination of two or more atoms, from the same or different elements, creates a molecule. Compounds are a type of molecules made of atoms from different elements held together by chemical bonds.