Niel’s Bohr described the atomic model. He in his model showed that an atom is a small positively charged nucleus. Around the positively charged nucleus, electrons orbit in separate orbits.
The electrons in the outermost shell are responsible for the properties associated with an element.
The electrons at different shells have different energy. When an electron jumps from a shell of higher energy to a shell of lower energy, energy is released.
<span>A metal is one which ionizes easily and gives electrons whencompared to other elements.
So it should have a lower ionization energy.
Hence we would expect element 2 to be a metal.</span>