Answer:
The correct answer is B difficult to lose but easy to move.
Explanation:
Metals are chemical substances in which the electrons of the outer orbital or valence orbital are hold very tightly through intramolecular attraction by the nucleus present in the center of the atom of the metal.As a result it is very difficult to remove electron from the valence orbital of metal.
As electrons are hold very tightly by the nucleus of a metal,the electrons are present in very compact manner within metal which helps metal to be an excellent conductor.
Answer:
A. One unpaired electron
B. 5 unpaired electrons
Explanation:
In A ,Fe is in +3 oxidation state and Electronic configuration- [Ar]3d5
And NO2 is a strong field ligand hence it causes pairing in t2g orbitals and results one unpaired electron in dZX orbital.
In B, also Fe is in +3 oxidation state but F is weak field ligand hence causes no pairing of Electrons hence it results 5 unpaired electrons with electronic configuration t2g^3 eg^2
There is 67 gram of CO2 produced in the Octane reaction which is come after 2 SF
C) They each form similar compounds when combined with oxygen.
Explanation:
The given elements have a common characteristics as they each form similar compounds when combined with oxygen.
Beryllium, magnesium and calcium all are located in the alkaline earth group.
Elements in the same group have the same chemical properties.
- Density and melting point are physical properties of matter which varies down a group on the periodic table.
- Their reaction with oxygen denotes a statement of their chemical properties.
- Chemical properties of matter is a function of their valency.
- Group two elements have a valency of two. They have two electrons in their outermost shell.
- Therefore, they all form ionic bonds when they react with oxygen.
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Periodic table brainly.com/question/2690837
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Halogens (atoms with 7 valence electrons) and Hydrogen
or generally, atoms with their shells almost full
