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'Atomic Energy Levels of the Iron-Period Elements: Potassium through Nickel.' Journal of Physical and Chemical Reference Data, volume 14, number 2, 1985, pp. The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present). The number of protons determines how many electrons surround the nucleus, and it is the arrangement of these electrons that.
- The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit. Manganese, a chemical element that has a symbol Mn and atomic number 25. T he element is not found as a free element in nature but available in combination with iron and other minerals.
- The symbol of manganese is Mn and its atomic weight is 54.938044 atomic mass units or grams per mole. Manganese is a transition metal found in Period 4 and Group 7 or VII B of the Periodic Table of Elements. Manganese has a density of 7.3 grams per cubic centimeter. It has a melting point of 1,246 degrees Celsius.
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Atomic Number Of Manganese
Cr
CMn
DFe
Solution:
Outer electronic configurations of V, Cr, Mn and Fe are as follows.
$V(4s^2 3d^3), Cr(4s^1 3d^5), Mn(4s^23d^5), Fe(4s^23d^6)$
Outer electronic configuration of uni-positive ions are
$V^+(4s^13d^3), Cr^+ (3d^5), Mn^+(4s^13d^5), Fe^+ (4s^13d^6)$
Clearly, I.$E_2$ of Cr will be highest as $Cr^+$ has exactly half filled $d$-subshell.
1. When rain is accompanied by a thunderstorm, the collected rain water will have a pH value
2. Bottles containing $ce{C6H5I}$ and $ce{C6H5CH2I}$ lost their original labels. They were labelled A and B for testing. A and B were separately taken in test tubes and boiled with $ce{NaOH }$ solution. The end solution in each tube was made acidic with dilute $ce{HNO3}$ and then some $ce{AgNO3}$ solution was added. Substance B gave a yellow precipitate. Which one of the following statements is true for this experiment ?
3. Which of the following is used as a rocket propellant ?
4. The reagent commonly used to determine hardness of water titrimetrically is
5. During the dehydration of alcohols to alkenes by heating with conc. $H_2SO_4$, the initiating step is
6. Ethyl isocyanide on hydrolysis in acidic medium generates
7. Glass is a
1. Which of the following salts is coloured salt before heating?
2. Which of the following transition metals of 3 series has the lowest melting point?
3. Which of the following ions has the same number of unpaired electrons as those present in $V^{3+}$?
4. Among the transition metals of 3d series, the one that has the highest negative $M^{2+} /M$ standard electrode potential is
5. If $Cu^{2+}$ ions is treated with excess of $KCN$, the complex formed is
6. Which one of the following transition metal ions shows magnetic moment of 5.92 BM?
7. The magnetic moment of $Ni^{2+}$ ion (At. No. of Ni. is 28) in BM unit is
8. When $CuSO_4$ solution is treated with an excess of $KCN$, a colourless complex salt in which copper has a $d^{10}$ configuration is obtained. This complex is
9. The known oxidation states for both V and CO are
10. The expression for effective magnetic moment $ ({{mu }_{eff}}) $ is
1. In Wolff‐Kishner reduction, the carbonyl group of aldehydes and ketones is converted into
2. Identify compound X in the following sequence of reactions:
3. Identify a molecule which does not exist.
4. Identify the incorrect match.
Name IUPAC Official Name A Unnilunium i Mendelevium B Unniltrium ii Lawrencium C Unnilhexium iii Seaborgium D Unununnium iv Darmstadtium
Name | IUPAC Official Name | ||
---|---|---|---|
A | Unnilunium | i | Mendelevium |
B | Unniltrium | ii | Lawrencium |
C | Unnilhexium | iii | Seaborgium |
D | Unununnium | iv | Darmstadtium |