why h and he are kept in a sapareted
Answers
Answer:
Explanation:
1s - 2s - 2p - 3s - 3p - 4s - 3d- 4p - 5s - 4d - 5p - 6s - 4f - 5d - 6p - 7s - 5f - 6d - 7p
That is the order that electrons are added to atoms as the atoms get larger. Hydrogen and Helium only have an s orbital, which holds 2 electrons. The next level has p or orbitals, so it expands out to 8 elements. Once you get to 4s, notice the next level is 3d and not 4p. This is another new orbital, the d orbital, so another gap opens in the table. This is where you go from scandium over to zinc. Drop down to 6s (Barium) and notice the lanthanide series below the table inserted here. All the lanthanide elements, from lanthanum to lutetium, are between barium and hafnium on the table. This is because the new f orbital starts taking electrons, instead of them filling in the 5d orbital and making hafnium over to mercury.
The table has theoretical lines all the way to infinity. After element 118, element 119 and 120 would fill in under francium and radium. Element 121 would start a new gap for a theoretical g orbital, a new series that would widen the table even further, by an additional 20 elements, before reaching back to the super-actinides (on the same level as the lanthanides and actinides) and finally back into the main table.
Hydrogen is separated because these ever-widening gaps exist.
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BY Tolety Roshan
Answer:
Hydrogen is special, in a sense that it behaves both as group I and group 17 (halogen) because it can accept as well as reject an electron to attain stable configuration. That being said, it has more tendency to reject an electron like other group I elements like Na, K and others.
Explanation:
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