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Two electrons in helium are placed in only one shell while three electrons in lithium occupy two shells?
It is because the two electrons in helium are placed in K-shell. The K-shell has the capacity of only two electrons. Therefore, in Lithium the third electron is placed in the L-shell.
You can find the capacity of a shell to hold electrons by the formula 2n2 where n is the shell no.
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What were the first elements that were found in the periodic table?
The first elements discovered and placed on the periodic table were hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, and magnesium. These elements were identified based on their unique chemical properties and atomic structures.
Why does helium and hydrogen does not come in agroup of periodic table?
Helium has 2 valence electrons and hydrogen has 1 electron. So, they are placed in different groups.
What is the maximum number of electrons that can be placed in a Lewis dot diagram?
Eight, except for helium, which has a maximum of two.
Why is helium placed in group 8 if it has two valence electrons?
Helium is placed in group 8 (or 18) of the periodic table because it has a full outer electron shell, making it stable like the other noble gases in that group. Despite having only two valence electrons, helium achieves a stable electron configuration by having a full first electron shell.
Why is lithium magnetic?
Lithium is not inherently magnetic because it has no unpaired electrons to create a magnetic field. It is a paramagnetic material meaning it can become slightly magnetic when placed in a magnetic field, but it does not retain its magnetism once the external field is removed.
What were the first elements that were found in the periodic table?
The first elements discovered and placed on the periodic table were hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, and magnesium. These elements were identified based on their unique chemical properties and atomic structures.
Why Lithium carbon And Neon Are Placed In Period 2 in periodic table?
Lithium, carbon, and neon are placed in period 2 of the periodic table because they all have 2 energy levels. Lithium has 2 electrons in its outer energy level, carbon has 2 electrons in its second energy level, and neon has a complete second energy level with 8 electrons. This pattern follows the periodic table's organization based on increasing atomic number and electron configuration.
Why does helium and hydrogen does not come in agroup of periodic table?
Helium has 2 valence electrons and hydrogen has 1 electron. So, they are placed in different groups.
What is the maximum number of electrons that can be placed in a Lewis dot diagram?
Eight, except for helium, which has a maximum of two.
How many electrons are in a neutral atom lithium?
Three. Since the atom is neutral the number of protons and electrons will be equivalent. Lithium is atomic number 3 indicating there are 3 protons in the element, hence three electrons.
What is the highest sublevel electrons in the element Promethium an f block element occupy?
The highest sublevel that Promethium can have is 4f. It is possible for 14 electrons to be placed around Promethium, since the elements in this sublevel each have 7 orbitals.
What is the electron configuration for the ion Li?
The element Lithium has a total of three electrons. The first two electrons would be placed in the 1s orbital. Then the third electron would be placed above the first two, in the 2s orbital. Because Lithium Ion has a +1 charge, one electron would be missing. So only the 1s orbital would be full.
Why is helium placed in group 8 if it has two valence electrons?
Helium is placed in group 8 (or 18) of the periodic table because it has a full outer electron shell, making it stable like the other noble gases in that group. Despite having only two valence electrons, helium achieves a stable electron configuration by having a full first electron shell.
Lewis dot diagram for helium?
He :The number of electrons in an atom's outer electron shell determines how many dots there are. Helium has 2 electrons in its outer electron shell, so 2 dots.
Why is lithium magnetic?
Lithium is not inherently magnetic because it has no unpaired electrons to create a magnetic field. It is a paramagnetic material meaning it can become slightly magnetic when placed in a magnetic field, but it does not retain its magnetism once the external field is removed.
Why can helium be placed in group II?
The reason it can be placed in group II is because it has 2 electrons in its outside shell (also its only shell) and the groups represent how many electrons in the elements outside shell, the reason it is normally placed in group 8 or 0 is because the first shell has a maximum of 2 electrons and all elements that have a full outside shell are placed in group 8/0 and can't normally react.
What element is to be more reactive lithium or neon?
Lithium by far, it is an alkali metal. Alkali metals are known to explode when they are placed in water (hydrogen gas is released). Nitrogen has two electrons to fill, and alkali metals have one electron to give off. Think of it as 2>1. Just know that lithium is more reactive than nitrogen.
