The atom of an element X has 7 electrons in its M shell
(a) Write the electronic configuration of element X.
(b) What is the atomic number of element X ?
(c) Is it a metal or a non-metal
(d) What type of ion will be formed by an atom of element X ? Write the symbol of the ion formed
(e) What could element X be ?

Write the electronic configuration of an element X whose atomic number is 12.

Write the electronic configuration of the element with atomic number 102 .

An atom has electronic configuration 2, 8, 7. What is the atomic number of this element?

Write the electronic configuration of the element having atomic number 56

Write the electronic configuration of the elements with the atomic number 61,91,101 and 109 .

An atom of element E contains 3 protons, 3 electrons and 4 neutrons : (a) What is its atomic number ? (b) What is its mass number ? (c) Write the electronic configuration of the element E (d) State whether element E is a metal or non-metal. Why ? (e) What type of ion, cation of anion, will be formed by an atom of element E ? Why ? (f) Write the symbol of the ion formed by an atom of element E (g) What could element X be ?

The electronic configuration of an element with atomic number 7 i.e. nitrogen atom is.