That is beryllium.
The element you are describing is oxygen. It has 6 valence electrons and 2 energy levels, placing it in group 16 of the periodic table as a nonmetal.
If it has electrons in three different energy levels, then it must be in period 3 of the periodic table. To have the fewest electrons, it would be in group 1. So, the element in group 1, period 3 is sodium (Na).
The atom of an element in the third period of the Periodic Table has 3 energy levels and so on. Also, atoms of elements in the same group have the same no. of valence electrons.
The element that has 5 energy levels and is in group 2 of the periodic table is Calcium (Ca). It has 20 electrons in total, with 2 in the first energy level and 8 each in the second and third energy levels, and 2 in the fourth energy level.
An element with 2 energy levels and 2 electrons in the outer layer is beryllium (Be). Beryllium has an atomic number of 4, with 2 electrons in the first energy level and 2 electrons in the second energy level, making it a neutral atom.
The number of electrons in the highest occupied energy level of an element in Group 15 is 5. Group 15 elements have 5 valence electrons, which occupy the highest energy level.
going down a group, each element gains 1 shell (energy levels)
the period number tells which is the highest energy level occupied by the electrons
the group number shows the number of electrons in the outermost energy levels. forexample sodium (Na) have 1 electron in the outermost shell and is placed in the group 1. Elements are grouped in rows depending on their energy levels, or valence electron numbers. Columns of elements are those that are chemically similar, or react
The element in the fourth period with atoms that have the same number of electrons in their highest energy level as tin is germanium. Both tin and germanium are in the same group (Group 14) of the periodic table, so they have the same number of valence electrons.
arsenic belongs to V-A group of periodic table it has 5 electrons in its outermost energy level.
It would be 3 electrons!Why?Antimony: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p3 Nitrogen: 1s2,,2s2,2p3Phosphorus: 1s2 2s2 2p6 3s2 3p3Arsenic: 3d10 4s2 4p3Bismuth: 4f14 5d10 6s2 6p3so on..