The identity of the substance is Iron.
<h3>Properties of Iron</h3><h3>Chemical properties</h3>
- The element iron has the atomic number 26 and the symbol Fe
- Electronic configuration of Fe is [AR] 3d6 4s2
- The atomic weight of Iron is 55.847
- The element iron belong to the group VIII of the periodic table
- It is the fourth most prevalent element in the crust of the world
- It is a highly reactive element as it gets rusted readily in the moisture of air
<h3>Physical properties</h3>
- It is a heavy metal in the first transition series
- The color of iron is silvery grey
- High malleability and ductility
- It has a strong electrical conductivity.
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Answer:
<h3>A-5N B-6N C-7N D-8N</h3>
Explanation:
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Answer: a. +2, cation and magnesium ion .
b. -1, anion, chloride
c. -2, anion, oxide
d. +1. cation , potassium ion
Explanation:
When an atom accepts an electron negative charge is created on atom and is called as anion.
When atom loses an electron positive charge is created on atom and is called as cation.
Magnesium (Mg) with atomic number of 12 has electronic configuration of 2,8,2 and thus it can lose 2 electrons to form 
cation and becomes magnesium ion.
Chlorine (Cl) with atomic number of 17 has electronic configuration of 2,8,7 and thus it can gain 1 electron to form 
anion and becomes chloride.
Oxygen (O) with atomic number of 8 has electronic configuration of 2,6 and thus it can gain 2 electrons to form 
anion and becomes oxide.
Potassium (K) with atomic number of 19 has electronic configuration of 2,8,8,1 and thus it can lose 1 electron to form 
cation and becomes potassium ion.
Explanation:The five major branches of chemistry are organic, inorganic, analytical, physical, and biochemistry.
...
Sub-branches of physical chemistry include:
Photochemistry — the study of the chemical changes caused by light.
Surface chemistry — the study of chemical reactions at surfaces of substances
