An element has 2 electrons in the M shell. What is the atomic number of the element ?

The atom of an element has 2 electrons in the M shell. What will be the atomic number of the element? Name the element.

The atom of an element X has 7 electrons in its M shell. What is the atomic number of element X ?

A trinegative ion of an element has 8 electrons in its M shell. The atomic number of the element is

An element has three electrons in th 4^(th) shell, the atomic number of the element is :

An atom of an element has two electrons in the M shell. What is the (a) atomic number (b) number of protons in this element ?

An element has 5 valence electrons and three shells what is the atomic number

An element A has 2 electrons in its, fourth shell. State its atomic number

An element has one electron in the 'M' shell. Identify the element.

An element has 5 valence electrons and three shells what is the group number