I have seven valence electrons and I have two more protons than phosphorus who am I

Answer : The unknown element is, chlorine.

Explanation :

As we are given that there are seven valance electrons and two more protons than phosphorous.

As we know that, phosphorous is a non-metal which belongs to group 15.

The atomic number of phosphorous is, 15 that means there are 15 electrons in phosphorus atom.

The electronic configuration of phosphorus is:

As the unknown element has two more protons than phosphorus that is 15 + 2 = 17

The electronic configuration of will be:

The unknown element have seven valance electrons. Thus, the element will be chlorine.

Hence, the unknown element is, chlorine.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.