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Why is helium normally placed in group 18?
We all know that helium is a noble gas. It has atomic number 2 but it is placed in 18 group be because in 1st group the elements have only one electron in thier s orbital e.g. Hydrogen, lithium, sodium, potassium etc. But helium has two electron so it cannot exist in 1 group. In second group the s orbital are same but the physical and properties of helium is different from the elements present in second group. According to modern periodic table elements which have same physical properties are placed in same group. Since helium is an inert gas and its physical properties are similar to the other elements of the 18 group and also helium discoverd late so that hilium can be put in the 18 group
How many electrons do the elements of the most stable group have in their outer layer?
Eight, except for helium which has two.
How does neon compare to other elements in its group?
8 electrons in its outmost shell (only helium has two)
What elements would be expected to have chemical and physical properties most similar to those of the krypton (Kr)?
Other elements in the same group will have similar chemical and physical properties to krypton. Krypton (Kr) is in group 18 of the periodic table, called the noble gases. Other noble gases, such as neon (Ne) or argon (Ar), will have similar chemical and physical properties to krypton.
What two elements only need two valence electrons to be happy?
The two elements that only need two valence electrons to achieve a stable electron configuration are helium (He) and beryllium (Be). Helium, being a noble gas, has a full outer shell with two electrons, making it stable. Beryllium, a metal, typically forms compounds by sharing or losing its two valence electrons to achieve a stable state, similar to that of helium.
What are two elements with properties most like helium?
Neon and argon, the two elements immediately below helium in column 18 of a wide form periodic table.
Why is helium in group 18 in the periodic table?
We all know that helium is a noble gas. It has atomic number 2 but it is placed in 18 group be because in 1st group the elements have only one electron in thier s orbital e.g. Hydrogen, lithium, sodium, potassium etc. But helium has two electron so it cannot exist in 1 group. In second group the s orbital are same but the physical and properties of helium is different from the elements present in second group. According to modern Periodic Table elements which have same physical properties are placed in same group. Since helium is an inert gas and its physical properties are similar to the other elements of the 18 group and also helium discoverd late so that hilium can be put in the 18 group
What is the number of valence electron for the elements in Group 8A?
Eight, except for helium which has two.
Why is helium normally placed in group 18?
We all know that helium is a noble gas. It has atomic number 2 but it is placed in 18 group be because in 1st group the elements have only one electron in thier s orbital e.g. Hydrogen, lithium, sodium, potassium etc. But helium has two electron so it cannot exist in 1 group. In second group the s orbital are same but the physical and properties of helium is different from the elements present in second group. According to modern periodic table elements which have same physical properties are placed in same group. Since helium is an inert gas and its physical properties are similar to the other elements of the 18 group and also helium discoverd late so that hilium can be put in the 18 group
How many electrons do the elements of the most stable group have in their outer layer?
Eight, except for helium which has two.
How does neon compare to other elements in its group?
8 electrons in its outmost shell (only helium has two)
What two elements are common in the sun?
The two common elements found in the sun are Hydrogen and Helium.
Does helium have hydrogen in it?
No. Helium and Hydrogen are two different elements.
What elements would be expected to have chemical and physical properties most similar to those of the krypton (Kr)?
Other elements in the same group will have similar chemical and physical properties to krypton. Krypton (Kr) is in group 18 of the periodic table, called the noble gases. Other noble gases, such as neon (Ne) or argon (Ar), will have similar chemical and physical properties to krypton.
What are the two elements which have similar chemical properties to iodine?
The two elements with similar chemical properties to iodine are bromine and chlorine. They all belong to the halogen group in the periodic table, sharing similar reactivity and chemical behavior.
What are the two main elements found in the stars?
Hydrogen and helium
How many elements make up period 1?
Only two: hydrogen and helium. This corresponds to the fact that there can be only two s orbital electrons in any electron shell, and the first shell has only s orbital electrons.
