Question

a element
X has atomic number 13 and atomic mass 27 ? draw atomic structure of an atom X when it looses 3 electrons ? also write number of protons and number neutron in the element

Answer 1

The element is Aluminium.(Atomic number of Aluminium = 13)

While drawing, number of electrons = 13-3 =10. (Neon)
therefore, K shell = 2 electrons and L shell = 8 electrons

Valency is the combining capacity of an atom