An atom has no electrical charge because

An atom has no electrical charge simply because the number of protons is equal to the number of electrons. However, if the atom gains an extra electron, it becomes negatively charged. If it loses and electron, then the atom becomes positively charged

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How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.