Electron arrangement
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what are cations
When an atom loses electron(s), it becomes positively charged and it is a cation - as the number of protons > number of electrons.
what are anions
When an atom gains electron(s), it becomes negatively charged and it is an anion - as the number of electrons > number of protons.
arrangement of electrons according to Bohr’s model
According to the Bohr model of atom, it shows that the electrons in the atoms are situated in certain electron shells or “energy levels” (occupied electron shells) moving around the nucleus. Each electron shell can only accommodate certain number of electrons and they are at different distances from the nucleus.
what did Bohr find out about the distance of the electron and the nucleus
Bohr found that the closer an electron is to the nucleus, the more energy needed to remove it from the atom, because it is attracted by the nucleus more strongly. It is opposite to those electrons which are further away from the nucleus. The arrangement of electrons in an atom hence determines the chemical properties of an element.
how are electrons filled
● The innermost electron shell is filled first. ● The outer electron shell will be filled after completely filling up the inner one. ● The last occupied electron shell is described as the outermost electron shell.