Which matter particle has 34 protons and 36 electrons in the following configuration : 1s^ 2 2s^ 2 2p^ 6 3s^ 2 3p^ 6 4s^ 2 4p^ 5 ? kratom krion se atom se ion

Selenium ion.

Explanation:

The atomic number of selenium is 34 which means it have 34 protons and 34 electrons. In given statement 36 electrons are mentioned which means two extra electrons are gained by the selenium.

When an atom gain the electrons it form the negative ion.

Selenium by gaining the 2 extra electrons form Se²⁻.

Electronic configuration of Se:

Se₃₄ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴

Se²⁻=  1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

4p⁴ have four electrons, to attain the stable electronic configuration selenium gain to more electrons and complete the octet.