OB 1s22s22p63s23p6
OC 1s22s22p63s2305
OD 1s22s²2p63s23d10452
Answer:
1s2 2s2 2p6 3s2 3d5 is a pseudo-noble-gas electron configuration
Explanation:
It is the technetium with atomic number 43. Being the lightest element having isotopes with all radioactive and no one are more stable as compared to that of technetium which is in fully ionised state i.e. 97 Tc. This element is mostly used for gamma ray emission in medical treatment. Also found to be used as corrosion inhibitor in case of steel, when present in small amount gives better result. This metal is silver grey colour that is found to discoloration when comes in contact with moist air. Its isotopes are radioactive.
Answer:
1s2 2s2 2p6 3s2 3p6 3d10
Explanation:
A pseduo noble gas configuration refers to charged species with electron configurations that are almost identical to that of one of the noble gases.
The noble gas (n-1)d^10 (where n refers to the principal quantum number of the outer s orbital) configuration of ions is commonly known as a pseudo noble gas configuration. The configuration stated in the answer is for Cu^+ ion. n in the case of Cu^+ ion is 4(since copper metal has a 4s1 level).
Note that; 1s2 2s2 2p6 3s2 3p6 is the electron configuration for argon, followed by 3d^10. Hence our definition for a pseudo noble gas.
(2) rubidium (4) cesium
Answer is: 3) francium.
The atomic radius of a chemical element is a measure of the size of its atom.
The atomic radius varies with increasing atomic number, but usually increases because of increasing of number of electrons.
Potassium (K), rubidium (Rb), ceasium (Cs) and francium (Fr) are in group 1 (the alkali metals) of the periodic tabl.
The atomic radius increases down the group of Periodic table and francium is on the bottom of the group 1 with highest atomic number.
The atom with the largest atomic radius among potassium, rubidium, cesium, and francium is francium, due to it being furthest down the group of alkali metals.
The atomic radius increases as we move down a group on the periodic table. This is because the number of energy levels increases, which causes the electron cloud to expand. Hence, in this case, the largest atomic radius would belong to francium, as it is the furthest down the group of alkali metals (which includes potassium, rubidium, and cesium).
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Answer:
true
Explanation:
because it is
FE stands for iron in the Periodic Table of Elements.
Iron is a chemical element with the atomic number 26 and the symbol Fe, derived from the Latin word "ferrum." It is a transition metal and belongs to Group 8 and Period 4 of the periodic table.
Iron is well-known for its distinctive qualities, including its tremendous strength, silvery-gray colour, and magnetic tendency. It is an essential component in the creation of steel and is necessary for many biological activities, including the transfer of oxygen in the blood. Iron compounds are frequently employed in both industrial settings and daily life.
Learn more about Iron, here:
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