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helium has 2 valence has electrons. Group 2 elements also have 2 valence electrons.
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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.
Which two letters represent elements in the same group?
Elements in the same group have similar chemical properties. For example, potassium (K) and rubidium (Rb) are in the same group (Group 1) on the periodic table.
What are two elements with properties most like helium?
Neon and argon are two elements with properties most like helium. They belong to the same group (Noble gases) as helium, exhibit similar inert behavior, and have filled valence electron shells.
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 element has properties that are similar to neon?
Any of the noble gases. Argon an Helium are the two closest in the periodic table and would be extremely similar. Neon is a noble gas (chemically inert). The noble gases are helium, neon, argon, krypton, xenon, and radon. The best way to find elements that are similar is to look at a periodic table of elements. The elements with similar characteristics are grouped and listed in vertical columns (above or below one another).
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.
How many elements make up period 1?
Period 1 contains 2 elements: Hydrogen and Helium.
