Why is helium not adjacent to hydrogen, which has an atomic number of 1?
Understand the Problem
The question is asking why helium (atomic number 2) is not placed next to hydrogen (atomic number 1) in the periodic table, despite their atomic numbers being consecutive. This relates to the organization of the periodic table based on electron configuration and chemical properties.
Answer
Helium is placed in Group 18 with other noble gasses because if its inert properties. Hydrogen is placed in Group 1 because of its properties similar to alkali metals.
Helium is not placed next to hydrogen on the periodic table because it behaves as an inert gas, fitting into Group 18 with other inert gases due to its stable electronic configuration. Hydrogen, with properties similar to alkali metals, is placed in Group 1.
Answer for screen readers
Helium is not placed next to hydrogen on the periodic table because it behaves as an inert gas, fitting into Group 18 with other inert gases due to its stable electronic configuration. Hydrogen, with properties similar to alkali metals, is placed in Group 1.
More Information
The periodic table organizes elements based on their chemical properties and electronic configurations, not just their atomic numbers. This arrangement reflects how elements behave and interact with each other.
Tips
It's a common misconception to think elements are arranged strictly by atomic number. The periodic table prioritizes grouping elements with similar chemical behaviors.
Sources
- Why doesn't an atoms atomic number correlate with how common ... - reddit.com
- The atomic number of hydrogen is 1 and that of helium is 2 ... - BYJU'S - byjus.com
- Since helium is number two and hydrogen number one why isn't helium next to or under hydrogen on the periodic table? After all number three lithium and four beryllium are all nearby each other on the table - quora.com
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