Answer:
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.
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Answer:
H₂O
Explanation:
Two molecules of Hydrogen and one molecules of Oxygen, when mixed, create H₂O, or water. There is no scientific name for H₂O due to it's common name. It is just refereed to as "water" or H₂O.
Answer:
Structure has been shown below
Explanation:
- In a Lewis structure, least electronegative atom is taken as central atom (except H)
- Total valence electrons of constituting atoms are used to construct Lewis structure
- A bond between two atoms are represented by a horizontal line or a dotted line (two dots).
- Spatial rearrangement of atoms are neglected in Lewis structure.
- H has one valence electron and O has six valence electrons. So, total valence electrons in
are 8 - Lewis structure of
has been given below.