The element immediately following hydrogen is helium, the atom ____ which contains two electrons.
举一反三
- A chemical compound that contains two atoms of oxygen and one atom of another chemical element is called ______
- When there are two electrons in the N-layer of a ground state atom, The M-layer must have A: 8 electrons B: 10 electrons C: 18 electrons D: 8-18 electrons
- （ ）is a simple compound of two atoms of hydrogen and one atom of oxygen.
- Water is a simple compound of two atoms of hydrogen and one atom of oxygen
- （ ）is a simple compound of two atoms of hydrogen and one atom of oxygen. A: Protein B: Water C: Fat D: Vitamin