Some species form social groups only with members of the same gender. for example, elephants form groups with only females and their offspring. once the male offspring reach a certain age, they leave the group and become solitary

This is common. deer do it as well.
it's nature's way of limiting inbreeding and keeping the herd healthy

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass