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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.


How many electrons can be placed in th second energy level?

In the second energy level, eight electrons are allowed at most.


What are the criteria used to placed an element under it is group and period?

Elements are placed in a group based on their similar chemical properties, such as reactivity and valence electrons. Elements are placed in a period based on the number of electron shells they have. Each period corresponds to the electron shell number of the elements in that period.


If those two atoms were put next to each other which way would the electons go?

To figure out what would happen to the electrons when two atoms are placed together, details to electronic configuration of both the participating atoms will be required. For example if interacting atoms are of inert gas then no electrons will be shared or transferred. Refer to the periodic table of elements to get the idea about the electronic configuration of different elements.


How does a Bohr model illustrate electron placement within an atom?

The Bohr model demonstrates electron placement by showing electrons orbiting the nucleus in specific energy levels, or "shells". Each shell can only accommodate a certain number of electrons, with the electrons closest to the nucleus having lower energy levels. The model helps us understand how electrons are organized and distributed within an atom.