An element 'X' have 3 electrons in its outer most third orbit.What will be its Atomic number and Number of proton in it.Write its Electronic configuration?

The element 'X' with 3 electrons in its outermost third orbit is likely to be Lithium (Li).

1. Atomic Number: The atomic number of an element is equal to the number of protons in its nucleus. Lithium has an atomic number of 3, which means it has 3 protons.

2. Number of Protons: As mentioned above, Lithium has 3 protons.

3. Electronic Configuration: The electronic configuration of an element describes the distribution of electrons in its atomic orbits. For Lithium, the electronic configuration is 2,1. This means there are 2 electrons in the first orbit (K shell), and 1 electron in the second orbit (L shell).

Please note that the third orbit (M shell) is not filled until the first two orbits (K and L shells) are filled according to the Aufbau principle. Therefore, if an element has 3 electrons in its outermost third orbit, it would have more than 3 protons and a higher atomic number. The description provided in the question best fits Lithium, which has its outermost electron in the second orbit.